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सिद्ध कीजिए कि `(1-sin theta)/(1+sin theta)=(sec theta-tan theta)^(2).`

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यहाँ `L.H.S.=(1-sin theta)/(1+sin theta)=(1-sin theta)/(1+sin theta)xx(1-sin theta)/(1-sin theta)`
`=((1-sin theta)^(2))/(1-sin^(2)theta)=((1-sin theta)^(2))/(cos ^(2)theta)=((1-sin theta)/(cos theta))^(2)=((1)/(cos theta)-(sin theta)/(cos theta))^(2)`
`=(sec theta-tan theta)^(2)=R.H.S.`

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