f(x)=sin(cos(4x))

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

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

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

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

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

Multiply cos * x
fx = ins(4cosx)

Remove parenthesis around (4cosx)
fx = ins * 4cosx

Reorder the terms for easier multiplication:
fx = 4ins * cosx

Multiply ins * cosx
fx = 4cinos2x

Solving
fx = 4cinos2x

Solving for variable 'f'.

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

Divide each side by 'x'.
f = 4cinos2

Simplifying
f = 4cinos2