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Let (sin(theta-alpha))/(sin(theta-beta))...

Let `(sin(theta-alpha))/(sin(theta-beta))=(a)/(b)` and `(cos(theta-alpha))/(cos(theta-beta))=(c )/(d)` then `(ac+bd)/(ad+bc)=`

A

`cos(alpha-beta)`

B

`sin(alpha - beta)`

C

`sin(alpha + beta)`

D

`cos(alpha + beta)`

Text Solution

Verified by Experts

The correct Answer is:
A
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