1.

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

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


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