f(x)=3cos^2(-4x)

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Solution for f(x)=3cos^2(-4x) equation: 


Simplifying
f(x) = 3cos2(-4x)

Multiply f * x
fx = 3cos2(-4x)

Remove parenthesis around (-4x)
fx = 3cos2 * -4x

Reorder the terms for easier multiplication:
fx = 3 * -4cos2 * x

Multiply 3 * -4
fx = -12cos2 * x

Multiply cos2 * x
fx = -12cos2x

Solving
fx = -12cos2x

Solving for variable 'f'.

Move all terms containing f to the left, all other terms to the right.

Divide each side by 'x'.
f = -12cos2

Simplifying
f = -12cos2

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