यदि cos x =-1/2, pi lt x lt (3pi)/2, 2 ...

यदि `cos x =-1/2, pi lt x lt (3pi)/2, 2 tan^2 x - 3 cosec^2 x` का मान है -

A

`4`

B

`10`

C

`2`

D

`8`

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The correct Answer is:

C

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