1.

सिद्ध कीजिए `(cos ^(2)theta)/(1-tan theta)+(sin ^(3)theta)/(sin theta-cos theta)=1+sin thetacos theta`

Answer» यहाँ L.H.S.` =(cos ^(2)theta)/(1-tan theta)+(sin ^(3)theta)/(sin theta-cos theta)`
`=(cos ^(3)theta)/(cos theta-sin theta)-(sin^(3)theta)/(cos theta-sin theta)=(cos ^(3)theta-sin ^(3)theta)/(cos theta-sin theta)`
`=((cos theta-sin theta)(cos ^(2)theta+sin ^(2)theta+cos thetasintheta))/((cos theta-sin theta))`
`=1+sin theta cos theta=`R.H.S.


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