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

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


Simplifying
f(x) = 4cos3(3x)

Multiply f * x
fx = 4cos3(3x)

Remove parenthesis around (3x)
fx = 4cos3 * 3x

Reorder the terms for easier multiplication:
fx = 4 * 3cos3 * x

Multiply 4 * 3
fx = 12cos3 * x

Multiply cos3 * x
fx = 12cos3x

Solving
fx = 12cos3x

Solving for variable 'f'.

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

Divide each side by 'x'.
f = 12cos3

Simplifying
f = 12cos3

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