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Prove the following trigonometric identi...

Prove the following trigonometric identities: `sqrt((1-sintheta)/(1+sintheta))=sectheta-tantheta` `sqrt((1+costheta)/(1-costheta))=cos e ctheta+cottheta`

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`(i)sqrt((1-sintheta)/(1+sintheta))`
`=sqrt((1-sintheta)/(1+sintheta)xx(1-sintheta)/(1-sintheta))`
`=>sqrt((1-sintheta)^2)/(1-sin^2theta)`
`=>sqrt((1-sintheta)^2)/(cos^2theta)`
`=>(1-sintheta)/(costheta) ...
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