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Simplifying sin(4x) + -2sin(2x) = 0 Remove parenthesis around (4x) ins * 4x + -2sin(2x) = 0 Reorder the terms for easier multiplication: 4ins * x + -2sin(2x) = 0 Multiply ins * x 4insx + -2sin(2x) = 0 Remove parenthesis around (2x) 4insx + -2ins * 2x = 0 Reorder the terms for easier multiplication: 4insx + -2 * 2ins * x = 0 Multiply -2 * 2 4insx + -4ins * x = 0 Multiply ins * x 4insx + -4insx = 0 Combine like terms: 4insx + -4insx = 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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