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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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