f(x)=x*cos(4x)

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Solution for f(x)=x*cos(4x) equation: 


Simplifying
f(x) = x * cos(4x)

Multiply f * x
fx = x * cos(4x)

Remove parenthesis around (4x)
fx = x * cos * 4x

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

Multiply x * cos
fx = 4cosx * x

Multiply cosx * x
fx = 4cosx2

Solving
fx = 4cosx2

Solving for variable 'f'.

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

Divide each side by 'x'.
f = 4cosx

Simplifying
f = 4cosx

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