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If cosxne-1, then what is (sinx)/(1+co...

If `cosxne-1`, then what is `(sinx)/(1+cosx)` equal to ?

A

`-"cot"(x)/(2)`

B

`"cot"(x)/(2)`

C

`"tan"(x)/(2)`

D

`-"tan"(x)/(2)`

Text Solution

Verified by Experts

The correct Answer is:
C

Consider `(sinx)/(1+cosx)=(2sinx//2cosx//2)/(1+2cos^(2)(x//2)-1)`
`(becausesin2x=2sinxcosxandcos2x=2cos^(2)x-1)`
`=(2sinx//2cosx//2)/(2cos^(2)x//2)=(sinx//2)/(cosx//2)=tanx//2`
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