f(x)=3x-cos(5X)

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Solution for f(x)=3x-cos(5X) equation: 


Simplifying
f(x) = 3x + -1cos(5X)

Multiply f * x
fx = 3x + -1cos(5X)

Remove parenthesis around (5X)
fx = 3x + -1cos * 5X

Reorder the terms for easier multiplication:
fx = 3x + -1 * 5cos * X

Multiply -1 * 5
fx = 3x + -5cos * X

Multiply cos * X
fx = 3x + -5cosX

Reorder the terms:
fx = -5cosX + 3x

Solving
fx = -5cosX + 3x

Solving for variable 'f'.

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

Divide each side by 'x'.
f = -5cosx-1X + 3

Simplifying
f = -5cosx-1X + 3

Reorder the terms:
f = 3 + -5cosx-1X

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