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【求证:(tanx+secx-1)/(tanx-secx+1)=(1+sinx)/cosx】
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求证:(tanx+secx-1)/(tanx-secx+1)=(1+sinx)/cosx优质解答
证明:(tanx+secx-1)/(tanx-secx+1) =(sinx-cosx+1)/(sinx+cosx-1) =(sinx-cosx+1)(sinx+cosx+1)/[(sinx+cosx-1)(sinx+cosx+1)] =2sinx(1+sinx)/(2sinxcosx) =(1+sinx)/cosx 故:(tanx+secx-1)/(tanx-secx+1)=(1+sin...
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