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" 27.If "A,B" ,and "C" are interior angl...

" 27.If "A,B" ,and "C" are interior angles of a triangle "ABC" then show that "sin((B+C)/(2))=cos(A)/(2)

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If A , B and C are interior angles of triangle ABC ,then show that sin ((B+C)/( 2) )=cos (A) /(2)

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