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Simplifying cot(-1x) = -1cot(x) Remove parenthesis around (-1x) cot * -1x = -1cot(x) Reorder the terms for easier multiplication: -1cot * x = -1cot(x) Multiply cot * x -1cotx = -1cot(x) Multiply cot * x -1cotx = -1cotx Add 'cotx' to each side of the equation. -1cotx + cotx = -1cotx + cotx Combine like terms: -1cotx + cotx = 0 0 = -1cotx + cotx Combine like terms: -1cotx + cotx = 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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