`A+B+C=180^@` = gt` cos^2(A/2)+cos^2 (B/2) +cos^2(C/2)`=
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To ask Unlimited Maths doubts download Doubtnut from - https://goo.gl/9WZjCW `A+B+C=180^@` = gt` cos^2(A/2)+cos^2 (B/2) +cos^2(C/2)`=
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