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Simplifying cos(x) + -1cos(3x) = 0 Multiply cos * x cosx + -1cos(3x) = 0 Remove parenthesis around (3x) cosx + -1cos * 3x = 0 Reorder the terms for easier multiplication: cosx + -1 * 3cos * x = 0 Multiply -1 * 3 cosx + -3cos * x = 0 Multiply cos * x cosx + -3cosx = 0 Combine like terms: cosx + -3cosx = -2cosx -2cosx = 0 Solving -2cosx = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Divide each side by '-2'. cosx = 0 Simplifying cosx = 0 The solution to this equation could not be determined.

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