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Question tests students knowledge of trigonometric identities and reverse chain rule integration.

Answered by Samuel G. • Maths tutor

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Why does the constant disappear when differentiating a function?

How do you find the inverse of a function?

Find the gradient of a curve whose parametric equations are x=t^2/2+1 and y=t/4-1 when t=2

I've been told that I can't, in general, differentiate functions involving absolute values (e.g. f(x) = |x|). Why is that?

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