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|[1,cos(alpha-beta), cos alpha] , [cos(a...

`|[1,cos(alpha-beta), cos alpha] , [cos(alpha-beta),1,cos beta] , [cos alpha, cos beta, 1]|`

A

`sin (alpha + beta)`

B

`sin alpha sin beta`

C

`1 + cos (alpha + beta)`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
D
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