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

If `cos x=(-1)/2` and `pi lt x lt (3 pi)/2`, then the value of `4 tan^2 x+3 cosec^2 x` is:
अगर `cos x=(-1)/2` और `pi

A

16

B

8

C

4

D

10

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