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)...
864 views · Published 12 October 2018 · 5:32 · Indexed 2 October 2026
Channel: Doubtnut · 2018 · Education
To ask Unlimited Maths doubts download Doubtnut from - https://goo.gl/9WZjCW 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)/4)`
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