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If tan theta=(a)/(b) such that (a sin th...

If `tan theta=(a)/(b)` such that `(a sin theta-b cos theta)/(a sin theta+b cos theta)=(a^(2)-b^(2))/(a^(2)+b^(2))^(k)` then k is ?

A

1

B

2

C

4

D

8

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