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In high school mathematics, why can the answer be that X equals a trigonometric function? Can any function be transformed like this?
Because the trigonometric function relation sin satisfies? θ+cos？ θ= 1
Therefore, equivalent substitution can be used. X and y originally represent unknowns, so unknowns can also be trigonometric functions. Not all of them can be replaced casually, and only those who meet this condition can be replaced.