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What is the derivative of sqrt((1+cosx)/...

What is the derivative of `sqrt((1+cosx)/(1-cosx))`

A

`1/2"sec"^(2)x/2`

B

`-1/2"cosec"^(2)x/2`

C

`-"cosec"^(2)x/2`

D

None of the above

Text Solution

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The correct Answer is:
B
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