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Simplifying cos(7x) + -1cos(9x) = 0 Remove parenthesis around (7x) cos * 7x + -1cos(9x) = 0 Reorder the terms for easier multiplication: 7cos * x + -1cos(9x) = 0 Multiply cos * x 7cosx + -1cos(9x) = 0 Remove parenthesis around (9x) 7cosx + -1cos * 9x = 0 Reorder the terms for easier multiplication: 7cosx + -1 * 9cos * x = 0 Multiply -1 * 9 7cosx + -9cos * x = 0 Multiply cos * x 7cosx + -9cosx = 0 Combine like terms: 7cosx + -9cosx = -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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