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If tan theta =(1)/(sqrt(7)), find the va...

If `tan theta =(1)/(sqrt(7))`, find the value of `("cosec"^(2)theta-sec^(2)theta)/("cosec"^(2)theta+sec^(2)theta)`.

A

`3//4`

B

`1//2`

C

2

D

`5//4`

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A
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