यदि `(costheta)/(1-sintheta)+(costheta)/(1+sintheta)=4` तो, – InterviewSolution

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1.	यदि `(costheta)/(1-sintheta)+(costheta)/(1+sintheta)=4` तो, `theta(0ltthetalt90^(@))` का मान बताइए ?A. `60^(@)`B. `45^(@)`C. `30^(@)`D. `35^(@)`
Answer» Correct Answer - a `(cos theta)/(1-sin theta)+(cos theta)/(1+sin theta)=4` `cos theta((1+sin theta+1-sin theta)/(sin^(2)theta))=4` `cos theta[(2)/(cos^(2)theta)]=4` `cos theta=(1)/(2)` `theta=60^(@)`

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