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Simplifying sin * 4x * cos * 2x + -1cos * 4x * sin * 2x = 0 Reorder the terms for easier multiplication: 4 * 2ins * x * cos * x + -1cos * 4x * sin * 2x = 0 Multiply 4 * 2 8ins * x * cos * x + -1cos * 4x * sin * 2x = 0 Multiply ins * x 8insx * cos * x + -1cos * 4x * sin * 2x = 0 Multiply insx * cos 8cinos2x * x + -1cos * 4x * sin * 2x = 0 Multiply cinos2x * x 8cinos2x2 + -1cos * 4x * sin * 2x = 0 Reorder the terms for easier multiplication: 8cinos2x2 + -1 * 4 * 2cos * x * ins * x = 0 Multiply -1 * 4 8cinos2x2 + -4 * 2cos * x * ins * x = 0 Multiply -4 * 2 8cinos2x2 + -8cos * x * ins * x = 0 Multiply cos * x 8cinos2x2 + -8cosx * ins * x = 0 Multiply cosx * ins 8cinos2x2 + -8cinos2x * x = 0 Multiply cinos2x * x 8cinos2x2 + -8cinos2x2 = 0 Combine like terms: 8cinos2x2 + -8cinos2x2 = 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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