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((1-tan theta)/(1-cot theta))^2 +1 =...

`((1-tan theta)/(1-cot theta))^2 +1` =

A

`sec^2 theta`

B

`cos^2 theta`

C

`sin^2 theta`

D

`cosec^2 theta`

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(1+tan^(2)theta)/(1+cot^(2)theta)=((1-tan theta)/(1-cot theta))^(2)

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Prove each of the following identities : (tan theta)/((1-cot theta)) + (cot theta)/((1- tan theta)) = (1+ sec theta "cosec" theta)

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