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Simplifying cos(5x) + -1cos(7x) = 0 Remove parenthesis around (5x) cos * 5x + -1cos(7x) = 0 Reorder the terms for easier multiplication: 5cos * x + -1cos(7x) = 0 Multiply cos * x 5cosx + -1cos(7x) = 0 Remove parenthesis around (7x) 5cosx + -1cos * 7x = 0 Reorder the terms for easier multiplication: 5cosx + -1 * 7cos * x = 0 Multiply -1 * 7 5cosx + -7cos * x = 0 Multiply cos * x 5cosx + -7cosx = 0 Combine like terms: 5cosx + -7cosx = -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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