4cos(x)-cos(4x)=0

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Solution for 4cos(x)-cos(4x)=0 equation: 


Simplifying
4cos(x) + -1cos(4x) = 0

Multiply cos * x
4cosx + -1cos(4x) = 0

Remove parenthesis around (4x)
4cosx + -1cos * 4x = 0

Reorder the terms for easier multiplication:
4cosx + -1 * 4cos * x = 0

Multiply -1 * 4
4cosx + -4cos * x = 0

Multiply cos * x
4cosx + -4cosx = 0

Combine like terms: 4cosx + -4cosx = 0
0 = 0

Solving
0 = 0

Couldn't find a variable to solve for.

This equation is an identity, all real numbers are solutions.

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