If f(x) = 4x(sin x + cos x) , find

asked May 14, 2023 57.2k views

1 vote

by Gecko

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It was found that

$f^(\prime)(x)=4xcos(x)-4xsin(x)+4sin(x)+4cos(x)$

Then, evaluating at x=4,

$f^(\prime)(4)=4*4cos(4)-4*4sin(4)+4sin(4)+4cos(4)=20cos(4)-12sin(4)$

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