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यदि cosA=4/5, तो सिद्ध कीजिए कि (tanA)/(...

यदि `cosA=4/5,` तो सिद्ध कीजिए कि `(tanA)/(1+tan^(2)A)=(sinA)/(secA).`

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secA(1-sinA)(secA+tanA)=1