1.

सिद्ध कीजिए `sin theta(1+tan theta)+cos theta(1+cot theta)=sectheta+cosec theta. `

Answer» यहाँ `L.H.S. =sin theta(1+tan theta)+cos (1+cos theta)`
`=sin theta(1+(sin theta)/(costheta))+cos theta(1+(cos theta)/(sin theta))`
`=sin theta((cos theta+sin theta)/(cos theta))+cos theta((sin theta+cos theta)/(sin theta))`
`=(sin^(2)(cos theta+sin theta)+cos ^(2)theta(sin theta+cos theta))/(cos thetasin theta)`
`=((sin ^(2)theta+cos ^(2))*(sin theta+cos theta))/(cos theta*sin theta)`
`=(sin theta)/(cos theta*sin theta)+(cos theta)/(cos theta*sin theta)=(1)/(cos theta)+(1)/(sin theta)`
`=sec theta+cosec theta=R.H.S.`


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