if a+b+c=180 then prove that cos^2 a/2 +cos^2 b/2 +cos^2 c/2 =2[1+sin A/2.cinb/2.sinc/2?
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if a+b+c=180 then prove that cos^2 a/2 +cos^2 b/2 +cos^2 c/2 =2[1+sin A/2.cinb/2.sinc/2?
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if a+b+c=180 then prove that cos^2 a/2 +cos^2 b/2 +cos^2 c/2 =2[1+sin A/2.cinb/2.sinc/2?
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