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If x=(2sintheta)/(1+costheta+sintheta),t...

If `x=(2sintheta)/(1+costheta+sintheta),t h e n(1-costheta+sintheta)/(1+sintheta)` is equal to `1+x` (b) `1-x` (c) `x` (d) `1/x`

A

`1/a`

B

a

C

`1-a`

D

`1+a`

Text Solution

Verified by Experts

The correct Answer is:
B

We have,
`a=(2sintheta)/(1+costheta+sintheta)`
`impliesa=(2sintheta(1+sintheta-costheta))/((1+costheta+sintheta)(1+sintheta-costheta))`
`impliesa=(2sintheta(1+sintheta-costheta))/((1+sintheta)^(2)-cos^(2)theta)`
`impliesa=(2sintheta(1+sintheta-costheta))/(2sintheta(1+sintheta))=(1+sintheta-costheta)/(1+sintheta)`
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