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Simplifying cos(x) + cos(7x) + cos(3x) + cos(5x) = 0 Multiply cos * x cosx + cos(7x) + cos(3x) + cos(5x) = 0 Remove parenthesis around (7x) cosx + cos * 7x + cos(3x) + cos(5x) = 0 Reorder the terms for easier multiplication: cosx + 7cos * x + cos(3x) + cos(5x) = 0 Multiply cos * x cosx + 7cosx + cos(3x) + cos(5x) = 0 Remove parenthesis around (3x) cosx + 7cosx + cos * 3x + cos(5x) = 0 Reorder the terms for easier multiplication: cosx + 7cosx + 3cos * x + cos(5x) = 0 Multiply cos * x cosx + 7cosx + 3cosx + cos(5x) = 0 Remove parenthesis around (5x) cosx + 7cosx + 3cosx + cos * 5x = 0 Reorder the terms for easier multiplication: cosx + 7cosx + 3cosx + 5cos * x = 0 Multiply cos * x cosx + 7cosx + 3cosx + 5cosx = 0 Combine like terms: cosx + 7cosx = 8cosx 8cosx + 3cosx + 5cosx = 0 Combine like terms: 8cosx + 3cosx = 11cosx 11cosx + 5cosx = 0 Combine like terms: 11cosx + 5cosx = 16cosx 16cosx = 0 Solving 16cosx = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Divide each side by '16'. cosx = 0 Simplifying cosx = 0 The solution to this equation could not be determined.
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