If tan theta = 1/sqrt7 " then" ((cosec^...

If ` tan theta = 1/sqrt7 " then" ((cosec^(2) theta -sec^(2) theta))/((cosec^(2)theta + sec^(2) theta))` is equal to

A

`frac(-2)(3)`

B

`frac(-3)(4)`

C

`frac(2)(3)`

D

`frac(3)(4)`

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