解个三角函数(1-2sin Xcos X)/(cos^2 X-sin^2 X) == (1-tan X)/(1+tan X)(cos B-1)^2+sin^2 B == 2-2cos B证明左右相等
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解个三角函数(1-2sin Xcos X)/(cos^2 X-sin^2 X) == (1-tan X)/(1+tan X)(cos B-1)^2+sin^2 B == 2-2cos B证明左右相等
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