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Let (sin(theta-alpha))/("sin"(theta-bet...

Let `(sin(theta-alpha))/("sin"(theta-beta))=a/b a n d(cos(theta-alpha))/("cos"(theta-beta))=c /d t h e n(a c+b d)/(a d+b c)=` (a)`cos(alpha-beta)` (b) `sin(alpha-beta)` `sin(alpha+beta)` (d) none of these

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