Further Pure Mathematics - 4PM1 PearsonEdexcel

Differentiation

Akopọ

Differentiation is the mathematical tool that captures how a quantity changes at every instant. Whether you need the slope of a curve, the velocity of a moving object, or the rate at which a chemical reacts, the derivative is the single idea that answers all of these questions in one framework.

In this topic you will master the power rule, learn to differentiate trigonometric, exponential and composite functions, and apply the product, quotient and chain rules to handle combinations of functions that arise throughout the 4PM1 specification and beyond.

Awọn Afojusun

  1. Differentiate sums of multiples of powers of x, sin ax, cos ax and e^(ax)
  2. Differentiate a product of two functions
  3. Differentiate a quotient of two functions
  4. Differentiate simple cases of a function of a function (chain rule)

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Akọ̀wé Ẹ̀kọ́

A straight line has a constant gradient, but most real-world relationships are curved. Differentiation gives you a way to pin down the instantaneous gradient of any curve at any point, turning a single snapshot of change into a complete picture of how one variable responds to another.

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  1. What is the derivative of y = 5x^3? A) 5x^2 B) 15x^2 C) 3x^2 D) 15x^3 Answer: B
  2. What is the derivative of y = sin 4x? A) cos 4x B) 4cos 4x C) -4cos 4x D) 4sin 4x Answer: B
  3. The product rule states that d/dx[uv] equals: A) u(dv/dx) - v(du/dx) B) u(dv/dx) + v(du/dx) C) (du/dx)(dv/dx) D) uv(du/dx + dv/dx) Answer: B
  4. What is the derivative of y = e^(3x)? A) e^(3x) B) 3xe^(3x) C) 3e^(3x) D) e^(3x)/3 Answer: C
  5. Using the chain rule, the derivative of y = (2x + 1)^5 is: A) 5(2x + 1)^4 B) 10(2x + 1)^4 C) 10(2x + 1)^5 D) 5(2x + 1)^5 Answer: B

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