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सिद्ध कीजिए:`2+(1)/(tan^(2)A)+(1)/(cot^(2)A)=sec^(2)A+cosec^(2)A.`

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बायाँ पक्ष`=2+(1)/(tan^(2)A)+(1)/(cos^(2)A)=2+cot^(2)A+tan^(2)A`
`=(1+tan^(2)A)+(1+cot^(2)A=sec^(2)A+cosec^(2)A`=दायाँ पक्ष।

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