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सिद्ध कीजिए:`1+(tan^(2)A)/(1+secA)=secA.`

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वाम पक्ष `=1+(tan^(2)A)/(1+secA)=1+(sec^(2)A-1)/(1+secA)`
`=1+((seA+1)(secA-1))/(1+secA)=secA=`दायाँ पक्ष

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