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Simplifying cos(x) + -1cos(2x) + cos(3x) = 0 Multiply cos * x cosx + -1cos(2x) + cos(3x) = 0 Remove parenthesis around (2x) cosx + -1cos * 2x + cos(3x) = 0 Reorder the terms for easier multiplication: cosx + -1 * 2cos * x + cos(3x) = 0 Multiply -1 * 2 cosx + -2cos * x + cos(3x) = 0 Multiply cos * x cosx + -2cosx + cos(3x) = 0 Remove parenthesis around (3x) cosx + -2cosx + cos * 3x = 0 Reorder the terms for easier multiplication: cosx + -2cosx + 3cos * x = 0 Multiply cos * x cosx + -2cosx + 3cosx = 0 Combine like terms: cosx + -2cosx = -1cosx -1cosx + 3cosx = 0 Combine like terms: -1cosx + 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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