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A-LEVEL / ACT / AP 官方授权考试中心 # ALevel数学中Differentiation关键考点

Differentiation对于国内考生来说是非常陌生的考点，它是ALevel数学学习过程中的重难点，为了帮助大家更好的复习ALevel数学，今天为大家总结ALevel数学中Differentiation关键考点，一起来学习一下吧！

Differentiation

For an increasing function f(x) in the interval (a, b), f’(x) > 0 in the interval a ≤ x ≤ b

For a decreasing function f(x) in the interval (a, b), f’(x) < 0 in the interval a ≤ x ≤ b

The points where f(x) stops increasing and begins to decrease are called maximum points

The points where f(x) stops decreasing and begins to increase are called minimum points

A point of inflection is a point where the gradient is at a maximum or minimum value in the neighbourhood of the point

A stationary point is a point of zero gradient. It may be a maximum, a minimum or a point of inflection

To find the coordinates of a stationary point:

Solve the equation f’(x) = 0 to find the value, or values, of x

Substitute into y = f(x) to find the corresponding values of y

The stationary value of a function is the value of y at the stationary point. You can sometimes use this to find the range of a function

You may determine the nature of a stationary point by using the second derivative

In problems where you need to find the maximum or minimum value of a variable y, first establish a formula for y in terms of x, then differentiate and put the derived function equal to zero to then find x and then y

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