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Simplifying sin(-1x) = cos(x) Remove parenthesis around (-1x) ins * -1x = cos(x) Reorder the terms for easier multiplication: -1ins * x = cos(x) Multiply ins * x -1insx = cos(x) Multiply cos * x -1insx = cosx Solving -1insx = cosx Solving for variable 'i'. Move all terms containing i to the left, all other terms to the right. Divide each side by '-1nsx'. i = -1cn-1o Simplifying i = -1cn-1o
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