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