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Simplifying sin(5x) * cos(2x) + -1cos(5x) * sin(2x) = 0 Remove parenthesis around (5x) ins * 5x * cos(2x) + -1cos(5x) * sin(2x) = 0 Remove parenthesis around (2x) ins * 5x * cos * 2x + -1cos(5x) * sin(2x) = 0 Reorder the terms for easier multiplication: 5 * 2ins * x * cos * x + -1cos(5x) * sin(2x) = 0 Multiply 5 * 2 10ins * x * cos * x + -1cos(5x) * sin(2x) = 0 Multiply ins * x 10insx * cos * x + -1cos(5x) * sin(2x) = 0 Multiply insx * cos 10cinos2x * x + -1cos(5x) * sin(2x) = 0 Multiply cinos2x * x 10cinos2x2 + -1cos(5x) * sin(2x) = 0 Remove parenthesis around (5x) 10cinos2x2 + -1cos * 5x * sin(2x) = 0 Remove parenthesis around (2x) 10cinos2x2 + -1cos * 5x * ins * 2x = 0 Reorder the terms for easier multiplication: 10cinos2x2 + -1 * 5 * 2cos * x * ins * x = 0 Multiply -1 * 5 10cinos2x2 + -5 * 2cos * x * ins * x = 0 Multiply -5 * 2 10cinos2x2 + -10cos * x * ins * x = 0 Multiply cos * x 10cinos2x2 + -10cosx * ins * x = 0 Multiply cosx * ins 10cinos2x2 + -10cinos2x * x = 0 Multiply cinos2x * x 10cinos2x2 + -10cinos2x2 = 0 Combine like terms: 10cinos2x2 + -10cinos2x2 = 0 0 = 0 Solving 0 = 0 Couldn't find a variable to solve for. This equation is an identity, all real numbers are solutions.
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