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Simplifying xcosy = ycosx Add '-1cosxy' to each side of the equation. cosxy + -1cosxy = cosxy + -1cosxy Combine like terms: cosxy + -1cosxy = 0 0 = cosxy + -1cosxy Combine like terms: cosxy + -1cosxy = 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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