1.

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

Answer»

`COS(alpha-beta)`
`SIN(alpha-beta)`
`sin(alpha+beta)`
`cos(alpha+beta)`

ANSWER :A


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