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यदि `(costheta)/(1-sintheta)+(costheta)/(1+sintheta)=4` तो, `theta(0ltthetalt90^(@))` का मान बताइए ?

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यदि `(costheta)/(1-sintheta)+(costheta)/(1+sintheta)=4` तो, `theta(0ltthetalt90^(@))` का मान बताइए ?
A. `60^(@)`
B. `45^(@)`
C. `30^(@)`
D. `35^(@)`
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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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