If ( cos (A+B))/( cos (A-B)) =( sin (C+...

If `( cos (A+B))/( cos (A-B)) =( sin (C+D))/( sin (C -D)) ` then prove that `tan A tan B tan C + tan D=0`................. A) `0` B) `-1` C) `sqrt3` D) `1`

A

0

B

`-1`

C

`sqrt3`

D

1

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The correct Answer is:

D

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