Math, asked by shanthkumargumbely, 6 months ago

if A+B+C=180°then prove that cos©a/2+cos©b/2+cos©c/2=2+2sina/2sinb/2sinc/2

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Answered by rajendrawange7

1

Answer:

If A+B+C=π then prove that cos2(A2 )+cos2(B2)-cos2(C2)=2cos(A2)cos(B2)sin(C2).

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