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Flash cards on derivatives: what a derivative means, the power, product, quotient and chain rules, derivatives of common functions, and stationary points.
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What does a derivative measure?
The instantaneous rate of change of a function, which is the gradient of its graph at a point. If y = f(x), the derivative is written dy/dx or f′(x).
What is the definition of the derivative from first principles?
f′(x) is the limit, as h tends to 0, of (f(x + h) − f(x)) ÷ h.
Derivative of a constant
The derivative of any constant is 0, because its graph is a flat line.
The power rule
The derivative of x^n is nx^(n − 1), for any real number n. For example, the derivative of x^5 is 5x^4.
Derivative of √x
√x = x^(1/2), so its derivative is ½x^(−1/2) = 1 ÷ (2√x).
Derivative of 1/x
1/x = x^(−1), so its derivative is −x^(−2) = −1 ÷ x^2.
Constant multiple and sum rules
The derivative of k f(x) is k f′(x). The derivative of f(x) + g(x) is f′(x) + g′(x), so you can differentiate a polynomial term by term.
Differentiate 3x^4 − 2x^2 + 7x − 5.
12x^3 − 4x + 7.
Derivative of sin x
cos x (with x in radians).
Derivative of cos x
−sin x (with x in radians).
Derivative of tan x
sec^2 x, which equals 1 ÷ cos^2 x (with x in radians).
Derivative of e^x
e^x. It is the only function (apart from multiples of it) that is its own derivative.
Derivative of e^(kx)
ke^(kx), using the chain rule.
Derivative of ln x
1/x, for x greater than 0.
Derivative of a^x
a^x ln a, for a positive constant a.
The chain rule
If y = f(g(x)), then dy/dx = f′(g(x)) × g′(x). Differentiate the outer function, keep the inner function, then multiply by the derivative of the inner function.
Differentiate (2x + 1)^5.
5(2x + 1)^4 × 2 = 10(2x + 1)^4.
The product rule
If y = uv, then dy/dx = u′v + uv′.
The quotient rule
If y = u ÷ v, then dy/dx = (u′v − uv′) ÷ v^2.
What is a stationary point?
A point where the gradient is zero, f′(x) = 0. It can be a local maximum, a local minimum or a point of inflection.
How does the second derivative test work?
At a stationary point, if f″(x) is greater than 0 it is a local minimum, and if f″(x) is less than 0 it is a local maximum. If f″(x) = 0, the test does not decide and you need another method.
How do you find the equation of a tangent at x = a?
Find the gradient m = f′(a) and the point (a, f(a)), then use y − f(a) = m(x − a).
This deck covers the first part of differential calculus: what a derivative means, the definition from first principles, the power, constant multiple and sum rules, the derivatives of common functions (powers, roots, reciprocals, sin, cos, tan, e^x, ln x and a^x), the chain, product and quotient rules with worked examples, stationary points, the second derivative test and tangent lines. It suits first-year university calculus, A level and IB maths, AP Calculus AB, Year 11 and Year 12 maths methods courses and anyone refreshing calculus before an engineering, science or economics degree. Drill the standard derivatives in Test mode until they are automatic, let spaced repetition handle the rules, and print the deck double-sided as a reference.
Updated October 28, 2026