求证tan(x+y)*tan(x-y)=tan^2x-tan^2y/1-tan^2xtan^2y
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求证tan(x+y)*tan(x-y)=tan^2x-tan^2y/1-tan^2xtan^2y求证tan(x+y)*tan(x-y)=tan^2x-tan^2y/1-tan^2xtan^2y求证ta
求证tan(x+y)*tan(x-y)=tan^2x-tan^2y/1-tan^2xtan^2y
求证tan(x+y)*tan(x-y)=tan^2x-tan^2y/1-tan^2xtan^2y
求证tan(x+y)*tan(x-y)=tan^2x-tan^2y/1-tan^2xtan^2y
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求证tan(x+y)*tan(x-y)=tan^2x-tan^2y/1-tan^2xtan^2y
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tan(x+y)=
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