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If A,B,C,D are four angles then sin (A...

If A,B,C,D are four angles then
`sin (A-B) cos (A+B) + sin B (B-C) .cos (B+C) + sin (C-D) cos (C+D)+ sin (D-A) cos (D+A)=`

A

0

B

1

C

`4 sin A.sinB sin C sin D`

D

`4 cos A cos B cos C cos D`

Text Solution

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The correct Answer is:
A
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