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If cot theta= sqrt7, then the value of (...

If `cot theta= sqrt7`, then the value of `(cosec^2 theta-sec^2 theta)/(cosec^2 theta+sec^2 theta)` is:
यदि`cot theta= sqrt7`, है, तो`(cosec^2 theta-sec^2 theta)/(cosec^2 theta+sec^2 theta)` का मान क्या होगा ?

A

`3/4`

B

`2/3`

C

`8/9`

D

`7/9`

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