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CBSE Class 10 Answered

trigonometry
Asked by | 05 Mar, 2009, 06:25: PM
answered-by-expert Expert Answer

A+B+C=180

sin({B+C}/2)=sin[(180-A)/2]=sin(90-(A/2)]=cos(A/2)

Answered by | 05 Mar, 2009, 06:50: PM
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