(cosec theta + sin theta)(cosec theta-sin theta) = cot?theta+cos?theta
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cosec^2theta - sin^2theta
= 1 + cot^2theta -1+cos^2theta
=cot^2theta+cos^2theta
i.e. ? =2
= 1 + cot^2theta -1+cos^2theta
=cot^2theta+cos^2theta
i.e. ? =2
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