1.

सिद्ध कीजिए कि `sqrt((1+cos theta)/(1-cos theta))+sqrt((1-cos theta)/(1+cos theta))=2cosec theta. `

Answer» यहाँ `L.H.S. =sqrt((1+cos theta)/(1-cos theta))+sqrt((1-cos theta)/(1+cos theta))=(1+cos theta+1-cos theta)/(sqrt((1-cos theta)(1+cos theta)))`
`=(2)/(sqrt(1-cos^(2)theta))=(2)/(sqrt(sin^(2)theta))=(2)/(sin theta)`
`=2 cosec theta=R.H.S.`


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