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)=`

`cos (alpha - beta)`

`sin (alpha - beta)`

`sin (alpha + beta)`

none of these

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