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If (sintheta+costheta)/(sintheta-costhe...

If `(sintheta+costheta)/(sintheta-costheta)=3` then the value of `sin^(4)theta` is :

A

`(16)/(25)`

B

`(1)/(5)`

C

`(4)/(5)`

D

`(3)/(5)`

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