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