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Evaluate sum(sin (A+B)sin(A-B))/(cos^(2)...

Evaluate `sum(sin (A+B)sin(A-B))/(cos^(2)A cos^(2)B)`: if non of `cos A , cos B, cos C` is zero.

A

0

B

1

C

2

D

`(1)/(2)`

Text Solution

Verified by Experts

The correct Answer is:
A
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