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"If "y=sqrt((2(tanalpha+cotalpha))/(1+ta...

`"If "y=sqrt((2(tanalpha+cotalpha))/(1+tan^(2)alpha)+(1)/(sin^(2)alpha))"when "alpha in ((3pi)/(4),pi)"then find "(dy)/(dalpha)" at"alpha=(5pi)/(6)`

A

`(4)/(3)`

B

`4`

C

`-4`

D

`-(1)/(4)`

Text Solution

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The correct Answer is:
B
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