1.

सिद्ध कीजिए `(sin theta)/(cot theta+cosec theta)=2+(sin theta)/(cot theta-cosec theta).`

Answer» यहाँ `(sin theta)/(cot theta+cosec theta)=2+(sin theta)/(cot theta-cosec theta).`
`implies(sin theta)/(cot theta+cosec theta)-(sin theta)/(cot theta-cosec theta)=2`
अब `L.H.S. =(sin theta)/(cot theta+cosec theta)-(sin theta)/(cot theta-cosec theta)=(sin theta)/(cottheta+cosec theta)+(sin theta)/(cosec theta-cot theta)`
`=sin theta{(1)/(cosec theta+cot theta)+(1)/(cosec theta-cot theta)}`
`=sin theta{(cosectheta-cot theta+cosec theta+cot theta)/(cosec ^(2)-cot^(2)theta)}`
`=sin theta(2 cosectheta)=2=R.H.S.`


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