For , evaluate…

MATHEMATICS · Single correct · A Level · Mathematics · Differentiation · Differentiation

Problem

For f(x)=x2cos⁡4xf(x)=x^{2}\cos 4x, evaluate f′ ⁣(π4)f'\!\left(\dfrac{\pi}{4}\right). (a) −π4-\dfrac{\pi}{4} (b) −π2-\dfrac{\pi}{2} (c) π2\dfrac{\pi}{2} (d) 00

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