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Mathematics, 18.07.2019 08:10 arelyhuerta
If a+b+c=pi show that cos a/2+cos b/2 cos c/2= 4cos (b+c/4)cos (c+a/4)cos(a+b/4)
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If a+b+c=pi show that cos a/2+cos b/2 cos c/2= 4cos (b+c/4)cos (c+a/4)cos(a+b/4)...
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