f(x)=-cos(x^2-5x)

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Solution for f(x)=-cos(x^2-5x) equation: 


Simplifying
f(x) = -1cos(x2 + -5x)

Multiply f * x
fx = -1cos(x2 + -5x)

Reorder the terms:
fx = -1cos(-5x + x2)
fx = (-5x * -1cos + x2 * -1cos)
fx = (5cosx + -1cosx2)

Solving
fx = 5cosx + -1cosx2

Solving for variable 'f'.

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

Divide each side by 'x'.
f = 5cos + -1cosx

Simplifying
f = 5cos + -1cosx

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