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Simplifying sin(2x) * cos(x) + -1cos(2x) * sin(x) = 0 Remove parenthesis around (2x) ins * 2x * cos(x) + -1cos(2x) * sin(x) = 0 Reorder the terms for easier multiplication: 2ins * x * cos * x + -1cos(2x) * sin(x) = 0 Multiply ins * x 2insx * cos * x + -1cos(2x) * sin(x) = 0 Multiply insx * cos 2cinos^{2}x * x + -1cos(2x) * sin(x) = 0 Multiply cinos^{2}x * x 2cinos^{2}x^{2}+ -1cos(2x) * sin(x) = 0 Remove parenthesis around (2x) 2cinos^{2}x^{2}+ -1cos * 2x * sin(x) = 0 Reorder the terms for easier multiplication: 2cinos^{2}x^{2}+ -1 * 2cos * x * ins * x = 0 Multiply -1 * 2 2cinos^{2}x^{2}+ -2cos * x * ins * x = 0 Multiply cos * x 2cinos^{2}x^{2}+ -2cosx * ins * x = 0 Multiply cosx * ins 2cinos^{2}x^{2}+ -2cinos^{2}x * x = 0 Multiply cinos^{2}x * x 2cinos^{2}x^{2}+ -2cinos^{2}x^{2}= 0 Combine like terms: 2cinos^{2}x^{2}+ -2cinos^{2}x^{2}= 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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