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If (2sinalpha)/(1+cosalpha +sinalpha)=...

If ` (2sinalpha)/(1+cosalpha +sinalpha)=y` , then prove that `(1-cosalpha+sinalpha )/(1+sinalpha)` is also equal to y.

A

y

B

`1//y`

C

`1+y`

D

`(1)/(1+y)`

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