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Simplifying cos(5x) + cos(x) + -1cos(3x) = 0 Remove parenthesis around (5x) cos * 5x + cos(x) + -1cos(3x) = 0 Reorder the terms for easier multiplication: 5cos * x + cos(x) + -1cos(3x) = 0 Multiply cos * x 5cosx + cos(x) + -1cos(3x) = 0 Multiply cos * x 5cosx + cosx + -1cos(3x) = 0 Remove parenthesis around (3x) 5cosx + cosx + -1cos * 3x = 0 Reorder the terms for easier multiplication: 5cosx + cosx + -1 * 3cos * x = 0 Multiply -1 * 3 5cosx + cosx + -3cos * x = 0 Multiply cos * x 5cosx + cosx + -3cosx = 0 Combine like terms: 5cosx + cosx = 6cosx 6cosx + -3cosx = 0 Combine like terms: 6cosx + -3cosx = 3cosx 3cosx = 0 Solving 3cosx = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Divide each side by '3'. cosx = 0 Simplifying cosx = 0 The solution to this equation could not be determined.
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