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