[" 2Let "(sin(theta-alpha))/(sin(theta-b...

[" 2Let "(sin(theta-alpha))/(sin(theta-beta))=(a)/(b)" and "(cos(theta-alpha))/(cos(theta-beta))=(c)/(d)" then "(ac+bd)/(ad+bc)=],[" 1."cos(alpha-beta)quad 2sin(alpha-beta)quad 3sin(alpha+beta)quad " 4.none of these "]

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[" 2Let "(sin(theta-alpha))/(sin(theta-beta))=(a)/(b)" and "(cos(theta-alpha))/(cos(theta-beta))=(c)/(d)" then "(ac+bd)/(ad+bc)=],[" 1."cos(alpha-beta)quad 2*sin(alpha-beta)quad 3*sin(alpha+beta)quad " 4.none of these "]

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[" 2Let "(sin(theta-alpha))/(sin(theta-beta))=(a)/(b)" and "(cos(theta-alpha))/(cos(theta-beta))=(c)/(d)" then "(ac+bd)/(ad+bc)=],[" 1."cos(alpha-beta)quad 2sin(alpha-beta)quad 3sin(alpha+beta)quad " 4.none of these "]