How do you find the derivative of $f(x)=10cos^3(4x)$ ?

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Answer 1 · 2017-06-16T16:41:22

$f'(x) = - 120 cos^2 (4x) * sin (4x)$

10 is constant
take x, multiply by 4,
take the cos,
power 3

you derivate down upwards:

$f'(x) = 10 * 3 cos^2 (4x) * (-sin (4x)) * 4$

How do you find the derivative of f(x)=10cos^3(4x)f(x)=10cos^3(4x)?