If A+B+C = π then prove that: cos A/2 + cos B/2 + cos C/2 = 4cos (π-A)/4.cos (π-B)/4.cos(π-C)/4

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If `A+B+C=pi` then prove that `cos(A/2)+cos(B/2)+cos(C/2)=4cos((pi-A)/4)cos((pi-B)/4)cos((pi-C)... If `A+B+C=pi` then prove that `cos(A/2)+cos(B/2)+cos(C/2)=4cos((pi-A)/4)cos((pi-B)/4)cos((pi-C)...
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Trigonometry: Proof of Cos A/2 + Cos B/2 - Cos C/2 = 4 Cos ( π+A)/4 Cos ( π+B)/4 Cos ( π-C)/4 Trigonometry: Proof of Cos A/2 + Cos B/2 - Cos C/2 = 4 Cos ( π+A)/4 Cos ( π+B)/4 Cos ( π-C)/4