If cos theta (1) = 2 cos theta (2), the...

If `cos theta _(1) = 2 cos theta _(2), ` then `tan (( theta _(1) + theta _(2))/(2)) tan (( theta _(1) - theta _(2))/(2))` is equal to

A

`(1)/(3)`

B

`-(1)/(3)`

C

1

D

-1

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The correct Answer is:

B

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