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If in a triangle ABC: Cos A + Cos B + Cos C = 3/2 then what is so special about this triangle?

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If in a triangle ABC:
Cos A + Cos B + Cos C = 3/2
then what is so special about this triangle?

posted Jul 23, 2016 by anonymous
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If P=Sin A.Sin B, Q= Sin C.Cos A, R = Sin A.Cos B and S=Cos A.Cos C then 5(P^2+Q^2+R^2+S^2) = ??

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