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Simplifying cos(4x) + cos(-1x) + -1cos(2x) = 0 Remove parenthesis around (4x) cos * 4x + cos(-1x) + -1cos(2x) = 0 Reorder the terms for easier multiplication: 4cos * x + cos(-1x) + -1cos(2x) = 0 Multiply cos * x 4cosx + cos(-1x) + -1cos(2x) = 0 Remove parenthesis around (-1x) 4cosx + cos * -1x + -1cos(2x) = 0 Reorder the terms for easier multiplication: 4cosx + -1cos * x + -1cos(2x) = 0 Multiply cos * x 4cosx + -1cosx + -1cos(2x) = 0 Remove parenthesis around (2x) 4cosx + -1cosx + -1cos * 2x = 0 Reorder the terms for easier multiplication: 4cosx + -1cosx + -1 * 2cos * x = 0 Multiply -1 * 2 4cosx + -1cosx + -2cos * x = 0 Multiply cos * x 4cosx + -1cosx + -2cosx = 0 Combine like terms: 4cosx + -1cosx = 3cosx 3cosx + -2cosx = 0 Combine like terms: 3cosx + -2cosx = 1cosx 1cosx = 0 Solving 1cosx = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Divide each side by '1'. cosx = 0 Simplifying cosx = 0 The solution to this equation could not be determined.
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