-cos(120)=cos(-120)

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Solution for -cos(120)=cos(-120) equation:


Simplifying
-1cos(120) = cos(-120)

Reorder the terms for easier multiplication:
-1 * 120cos = cos(-120)

Multiply -1 * 120
-120cos = cos(-120)

Reorder the terms for easier multiplication:
-120cos = -120cos

Add '120cos' to each side of the equation.
-120cos + 120cos = -120cos + 120cos

Combine like terms: -120cos + 120cos = 0
0 = -120cos + 120cos

Combine like terms: -120cos + 120cos = 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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