📚 Interactive Derivative Rules & Practice Hub

Master all derivative rules with interactive examples, step-by-step solutions, and 50+ practice problems. This is your complete learning companion to differentiation rules.

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Table of Contents

Complete Derivative Rules Reference Table

This comprehensive table includes all essential derivative rules you'll need for calculus. Bookmark this page for quick reference when solving problems. Each rule includes the formula, example, and when to use it.

Rule Name Formula Example When to Use
Constant Rule d/dx [c] = 0 d/dx [5] = 0 Differentiating any constant number
Power Rule d/dx [xⁿ] = n·xⁿ⁻¹ d/dx [x³] = 3x² Any term with variable raised to power
Constant Multiple Rule d/dx [c·f(x)] = c·f'(x) d/dx [3x²] = 3·2x = 6x Constant multiplied by function
Sum Rule d/dx [f(x) + g(x)] = f'(x) + g'(x) d/dx [x² + x³] = 2x + 3x² Sum of two or more functions
Difference Rule d/dx [f(x) - g(x)] = f'(x) - g'(x) d/dx [x³ - x²] = 3x² - 2x Difference between functions
Product Rule d/dx [f(x)·g(x)] = f'(x)·g(x) + f(x)·g'(x) d/dx [x·sin(x)] = 1·sin(x) + x·cos(x) Product of two functions
Quotient Rule d/dx [f(x)/g(x)] = [f'(x)·g(x) - f(x)·g'(x)] / [g(x)]² d/dx [x²/(x+1)] = [2x·(x+1) - x²·1]/(x+1)² Division of two functions
Chain Rule d/dx [f(g(x))] = f'(g(x))·g'(x) d/dx [sin(x²)] = cos(x²)·2x Composite functions (function of function)
Exponential Rule (eˣ) d/dx [eˣ] = eˣ d/dx [e³ˣ] = 3e³ˣ Natural exponential functions
Logarithmic Rule (ln x) d/dx [ln(x)] = 1/x d/dx [ln(x²)] = 2x/x² = 2/x Natural logarithm functions
Sine Rule d/dx [sin(x)] = cos(x) d/dx [sin(2x)] = 2cos(2x) Sine trigonometric functions
Cosine Rule d/dx [cos(x)] = -sin(x) d/dx [cos(x²)] = -2x·sin(x²) Cosine trigonometric functions
Tangent Rule d/dx [tan(x)] = sec²(x) d/dx [tan(3x)] = 3sec²(3x) Tangent trigonometric functions
General Power Rule d/dx [uⁿ] = n·uⁿ⁻¹·u' d/dx [(x²+1)³] = 3(x²+1)²·2x Power of a function (Chain + Power)
Implicit Differentiation d/dx [f(y)] = f'(y)·dy/dx d/dx [y²] = 2y·dy/dx Equations not solved for y

Pro Tip: Most real-world problems require combining multiple rules. For example, differentiating e^(x²)·sin(3x) requires Product Rule, Chain Rule, and Exponential Rule.

Power Rule: Complete Explanation with Examples

The Power Rule is the most fundamental derivative rule. It states that for any real number exponent n, the derivative of xⁿ is n·xⁿ⁻¹.

Basic Power Rule

f(x) = x⁴

Solution: f'(x) = 4x³

Apply the rule directly: bring down exponent, subtract 1.

Square Root as Power

f(x) = √x = x^(½)

Solution: f'(x) = ½x^(-½) = 1/(2√x)

Rewrite radicals as fractional powers first.

Negative Exponents

f(x) = 1/x³ = x⁻³

Solution: f'(x) = -3x⁻⁴ = -3/x⁴

Same rule works for negative exponents.

Why the Power Rule Works: Mathematical Proof

The Power Rule can be derived using the limit definition of the derivative:

1
Start with Definition
f'(x) = lim_(h→0) [f(x+h) - f(x)]/h

For f(x) = xⁿ, this becomes:

f'(x) = lim_(h→0) [(x+h)ⁿ - xⁿ]/h
2
Apply Binomial Theorem
(x+h)ⁿ = xⁿ + n·xⁿ⁻¹·h + [n(n-1)/2]·xⁿ⁻²·h² + ... + hⁿ

Substitute into the limit:

f'(x) = lim_(h→0) [xⁿ + n·xⁿ⁻¹·h + ... + hⁿ - xⁿ]/h
3
Simplify and Take Limit
f'(x) = lim_(h→0) [n·xⁿ⁻¹·h + terms with h² or higher]/h
f'(x) = lim_(h→0) [n·xⁿ⁻¹ + terms with h or higher]

As h→0, all terms with h disappear:

f'(x) = n·xⁿ⁻¹

Common Power Rule Mistakes to Avoid

Product Rule: How to Differentiate Products

The Product Rule is used when differentiating the product of two functions. The formula is often remembered as: "First times derivative of second, plus second times derivative of first."

Basic Product

f(x) = x²·sin(x)

Solution: f'(x) = 2x·sin(x) + x²·cos(x)

Exponential × Logarithm

f(x) = eˣ·ln(x)

Solution: f'(x) = eˣ·ln(x) + eˣ·(1/x)

Polynomial Product

f(x) = (x+1)·(x²+3)

Solution: f'(x) = 1·(x²+3) + (x+1)·2x

Step-by-Step: Product Rule Application

1
Identify f(x) and g(x)

For h(x) = x³·cos(x):

f(x) = x³, g(x) = cos(x)
2
Find Individual Derivatives
f'(x) = 3x² (Power Rule)
g'(x) = -sin(x) (Cosine Rule)
3
Apply Product Rule Formula
h'(x) = f'(x)·g(x) + f(x)·g'(x)
h'(x) = (3x²)·cos(x) + (x³)·(-sin(x))
4
Simplify Result
h'(x) = 3x²·cos(x) - x³·sin(x)

When NOT to Use Product Rule

Sometimes it's easier to multiply first, then differentiate:

Example: f(x) = (x+2)(x-3) = x² - x - 6

Then use Power Rule: f'(x) = 2x - 1 (easier than Product Rule).

Quotient Rule: Differentiating Fractions

The Quotient Rule is used for differentiating ratios of functions. A useful mnemonic is: "Low d-high minus high d-low, over low squared."

Rational Function

f(x) = (x²+1)/(x-1)

Solution: f'(x) = [2x·(x-1) - (x²+1)·1]/(x-1)²

Trig over Polynomial

f(x) = sin(x)/x

Solution: f'(x) = [cos(x)·x - sin(x)·1]/x²

Exponential over Polynomial

f(x) = eˣ/(x²+1)

Solution: f'(x) = [eˣ·(x²+1) - eˣ·2x]/(x²+1)²

Quotient Rule Proof from Product Rule

The Quotient Rule can be derived by rewriting the quotient as a product and using the Chain Rule:

1
Rewrite as Product
f(x)/g(x) = f(x)·[g(x)]⁻¹
2
Apply Product Rule
d/dx [f(x)·[g(x)]⁻¹] = f'(x)·[g(x)]⁻¹ + f(x)·d/dx[[g(x)]⁻¹]
3
Apply Chain Rule
d/dx[[g(x)]⁻¹] = -[g(x)]⁻²·g'(x)
4
Combine and Simplify
= f'(x)/g(x) - f(x)·g'(x)/[g(x)]²
= [f'(x)·g(x) - f(x)·g'(x)] / [g(x)]²

Quotient Rule vs. Product Rule

When deciding which to use:

Chain Rule: The Most Important Derivative Rule

The Chain Rule handles composite functions (functions within functions). It's arguably the most important derivative rule because composite functions appear everywhere in advanced mathematics, physics, and engineering.

Trigonometric Composite

f(x) = sin(3x²)

Solution: f'(x) = cos(3x²)·6x

Exponential Composite

f(x) = e^(x³)

Solution: f'(x) = e^(x³)·3x²

Power Composite

f(x) = (2x+1)⁵

Solution: f'(x) = 5(2x+1)⁴·2

Chain Rule: Multiple Compositions

For triple compositions, apply Chain Rule multiple times:

1
Identify Functions
f(x) = sin(e^(x²))

This is: sin(□) where □ = e^(○) and ○ = x²

2
Apply Chain Rule Step by Step
f'(x) = cos(e^(x²)) · d/dx[e^(x²)]
d/dx[e^(x²)] = e^(x²) · d/dx[x²]
d/dx[x²] = 2x
3
Combine Results
f'(x) = cos(e^(x²)) · e^(x²) · 2x
f'(x) = 2x·e^(x²)·cos(e^(x²))

When Chain Rule Combines with Other Rules

Most real problems combine Chain Rule with Product or Quotient Rule:

Example: f(x) = x²·sin(3x)

This needs Product Rule (for x²·sin(3x)) and Chain Rule (for sin(3x)).

Trigonometric Derivative Rules

All six trigonometric functions have specific derivative formulas. These are essential for physics, engineering, and any application involving periodic functions.

Function Derivative Proof Method Common Use
sin(x) cos(x) Limit definition Wave motion, oscillations
cos(x) -sin(x) Limit definition Phase shifts, AC circuits
tan(x) sec²(x) Quotient Rule (sin/cos) Slopes, angles
cot(x) -csc²(x) Quotient Rule (cos/sin) Complementary angles
sec(x) sec(x)tan(x) Chain Rule (1/cos) Trigonometric identities
csc(x) -csc(x)cot(x) Chain Rule (1/sin) Trigonometric identities

Proving sin(x) Derivative Using Limit Definition

1
Start with Definition
d/dx[sin(x)] = lim_(h→0) [sin(x+h) - sin(x)]/h
2
Use Sum Formula
sin(x+h) = sin(x)cos(h) + cos(x)sin(h)
d/dx[sin(x)] = lim_(h→0) [sin(x)cos(h) + cos(x)sin(h) - sin(x)]/h
3
Factor and Separate
= lim_(h→0) [sin(x)(cos(h)-1)/h + cos(x)sin(h)/h]
4
Use Known Limits
lim_(h→0) (cos(h)-1)/h = 0, lim_(h→0) sin(h)/h = 1
d/dx[sin(x)] = sin(x)·0 + cos(x)·1 = cos(x)

Exponential & Logarithmic Derivative Rules

Exponential and logarithmic functions have unique properties that make their derivatives particularly elegant and important for modeling growth, decay, and many natural phenomena.

The Natural Exponential Function eˣ

The function f(x) = eˣ is remarkable because it is its own derivative: d/dx[eˣ] = eˣ.

Basic Exponential

f(x) = e^(2x)

Solution: f'(x) = e^(2x)·2 = 2e^(2x)

Chain Rule: derivative of exponent (2x) is 2

General Exponential

f(x) = 5ˣ

Solution: f'(x) = 5ˣ·ln(5)

Rewrite: 5ˣ = e^(x·ln5), then Chain Rule

Exponential × Polynomial

f(x) = x·eˣ

Solution: f'(x) = eˣ + x·eˣ = eˣ(1+x)

Product Rule: (x)'·eˣ + x·(eˣ)'

Logarithmic Differentiation

For complex products/quotients/powers, logarithmic differentiation simplifies the process:

1
Start with Function
y = x^(sin x)

Direct differentiation is difficult.

2
Take Natural Log of Both Sides
ln y = ln(x^(sin x)) = (sin x)·ln x
3
Differentiate Implicitly
(1/y)·dy/dx = (cos x)·ln x + (sin x)·(1/x)
4
Solve for dy/dx
dy/dx = y·[(cos x)·ln x + (sin x)/x]
dy/dx = x^(sin x)·[(cos x)·ln x + (sin x)/x]

Implicit Differentiation

When a function is not explicitly solved for y (e.g., x² + y² = 25), we use implicit differentiation. We differentiate both sides with respect to x, treating y as a function of x.

Circle Equation

x² + y² = 25

Solution: 2x + 2y·dy/dx = 0 ⇒ dy/dx = -x/y

Folium of Descartes

x³ + y³ = 6xy

Solution: 3x² + 3y²·dy/dx = 6y + 6x·dy/dx

Trigonometric Implicit

sin(xy) = x

Solution: cos(xy)·(y + x·dy/dx) = 1

Step-by-Step: Implicit Differentiation

1
Differentiate Both Sides
Given: x³ + y³ = 6xy
d/dx[x³] + d/dx[y³] = d/dx[6xy]
2
Apply Rules (Chain Rule for y terms)
3x² + 3y²·dy/dx = 6y + 6x·dy/dx

Note: d/dx[y³] = 3y²·dy/dx (Chain Rule)

3
Collect dy/dx Terms
3y²·dy/dx - 6x·dy/dx = 6y - 3x²
4
Factor and Solve for dy/dx
dy/dx·(3y² - 6x) = 6y - 3x²
dy/dx = (6y - 3x²)/(3y² - 6x) = (2y - x²)/(y² - 2x)

Higher Order Derivatives

Second, third, and higher derivatives have important physical interpretations: velocity (1st derivative), acceleration (2nd), jerk (3rd), and beyond.

Second Derivative

f(x) = x⁴

f'(x): 4x³

f''(x): 12x²

Third Derivative

f(x) = sin(x)

f'(x): cos(x)

f''(x): -sin(x)

f'''(x): -cos(x)

Exponential Higher Derivative

f(x) = e^(2x)

f'(x): 2e^(2x)

f''(x): 4e^(2x)

Pattern: f⁽ⁿ⁾(x) = 2ⁿ·e^(2x)

Notation for Higher Order Derivatives

Applications of Higher Derivatives

Concavity Test: f''(x) > 0 ⇒ concave up; f''(x) < 0 ⇒ concave down

Second Derivative Test for Extrema: At critical point c, if f''(c) > 0 ⇒ local minimum; f''(c) < 0 ⇒ local maximum

25 Practice Problems with Solutions

Test your understanding with these carefully selected practice problems. Start with basics, then progress to challenging combinations.

# Function Required Rules Solution (Click to Reveal)
1 f(x) = 3x⁵ - 2x³ + 7 Power, Constant Multiple, Sum
2 f(x) = (2x+1)(x²-3) Product Rule or Expand First
3 f(x) = (x²+1)/(x-2) Quotient Rule
4 f(x) = √(3x²+1) Chain Rule, Power Rule
5 f(x) = sin(2x)cos(3x) Product Rule, Chain Rule
6 f(x) = e^(x²)·ln(x) Product Rule, Chain Rule, Exponential, Log
7 f(x) = tan(√x) Chain Rule (twice), Tangent Rule
8 f(x) = (2x³-1)⁴ Chain Rule, Power Rule
9 f(x) = x·e^(-x²) Product Rule, Chain Rule, Exponential
10 f(x) = ln(x²+1)/x Quotient Rule, Chain Rule, Log Rule

Challenge Problems

For advanced students:

Interactive Derivative Calculator

Practice applying the rules you've learned with this interactive tool. Enter any function and see step-by-step solutions.

Quick examples: Click any to try

Pro Tip: How to Check Your Answer

After finding a derivative, verify it using:

  1. Graphical check: Plot original function and derivative - slope should match
  2. Numerical check: Pick a point, compute slope using difference quotient
  3. Algebraic check: Simplify and compare with known results
  4. Online verification: Use our advanced calculator for complex functions

Frequently Asked Questions

Q: What's the difference between this page and your main calculator?

Our main calculator is designed for advanced calculations with features like 3D graphs, higher-order derivatives, and complex function analysis. This page is an interactive learning hub focused on teaching derivative rules with examples, practice problems, and step-by-step explanations. Think of it as your classroom, while the main calculator is your advanced toolkit.

Q: How do I know which rule to apply first?

Follow this decision tree:

  1. Is it a composite function? (function inside function) → Chain Rule
  2. Is it a product? (f(x)·g(x)) → Product Rule
  3. Is it a quotient? (f(x)/g(x)) → Quotient Rule
  4. Is it a sum/difference? → Differentiate term by term
  5. Is it a basic function? → Use corresponding rule (Power, Exponential, Trig, etc.)

Most problems require multiple rules applied in sequence.

Q: Why is the derivative of e^x equal to e^x?

This unique property comes from the definition of e as the base where the derivative of equals itself. Mathematically:

d/dx[eˣ] = lim_(h→0) [e^(x+h) - eˣ]/h = eˣ·lim_(h→0) [eʰ - 1]/h = eˣ·1 = eˣ

The limit lim_(h→0) [eʰ - 1]/h = 1 is actually the definition of the number e. This self-replicating property makes exponential functions essential for modeling continuous growth and decay.

Q: What are common mistakes when using Chain Rule?
  • Forgetting the inner derivative: d/dx[sin(3x)] ≠ cos(3x) (missing the 3)
  • Applying in wrong order: For f(g(h(x))), work from outside in
  • Misidentifying inner function: In sin(x²), inner is x² not sin(x)
  • Not simplifying after applying: Always simplify final expression
  • Confusing with Power Rule: (x²)³ uses Power Rule, but (x²+1)³ needs Chain Rule
Q: How can I practice and master all these rules?

Follow this 4-step mastery plan:

  1. Learn each rule individually with simple examples
  2. Practice combinations (Product + Chain, etc.) with medium difficulty
  3. Solve applied problems from physics, economics, biology
  4. Use our Daily Math Challenge for consistent practice

Consistency is key - 30 minutes daily is better than 5 hours once a week.

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