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Simplifying sin(3x) + sin(9x) = sin(12x) Remove parenthesis around (3x) ins * 3x + sin(9x) = sin(12x) Reorder the terms for easier multiplication: 3ins * x + sin(9x) = sin(12x) Multiply ins * x 3insx + sin(9x) = sin(12x) Remove parenthesis around (9x) 3insx + ins * 9x = sin(12x) Reorder the terms for easier multiplication: 3insx + 9ins * x = sin(12x) Multiply ins * x 3insx + 9insx = sin(12x) Combine like terms: 3insx + 9insx = 12insx 12insx = sin(12x) Remove parenthesis around (12x) 12insx = ins * 12x Reorder the terms for easier multiplication: 12insx = 12ins * x Multiply ins * x 12insx = 12insx Add '-12insx' to each side of the equation. 12insx + -12insx = 12insx + -12insx Combine like terms: 12insx + -12insx = 0 0 = 12insx + -12insx Combine like terms: 12insx + -12insx = 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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