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Simplifying -1cos(7x5) + cos(5x5) = 0 Remove parenthesis around (7x5) -1cos * 7x5 + cos(5x5) = 0 Reorder the terms for easier multiplication: -1 * 7cos * x5 + cos(5x5) = 0 Multiply -1 * 7 -7cos * x5 + cos(5x5) = 0 Multiply cos * x5 -7cosx5 + cos(5x5) = 0 Remove parenthesis around (5x5) -7cosx5 + cos * 5x5 = 0 Reorder the terms for easier multiplication: -7cosx5 + 5cos * x5 = 0 Multiply cos * x5 -7cosx5 + 5cosx5 = 0 Combine like terms: -7cosx5 + 5cosx5 = -2cosx5 -2cosx5 = 0 Solving -2cosx5 = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Divide each side by '-2'. cosx5 = 0 Simplifying cosx5 = 0 The solution to this equation could not be determined.
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