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cosA + cosB =...

cosA + cosB =

A

`2 sin ((A + B)/( 2)) sin ((A - B)/( 2))`

B

`2 cos ((A + B)/(2)) cos ((A - B)/( 2))`

C

`- 2 sin ((A + B)/( 2)) sin (( A - B)/( 2))`

D

`- 2 cos ((A + B)/( 2)) cos ((A - B)/(2))`

लिखित उत्तर

Verified by Experts

The correct Answer is:
B
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