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If `(b^2+c^2-a^2)/(2b c),(c^2+a^2-b^2)/(2c a),(a^2+b^2-c^2)/(2a b)` are in `A.P.` and `a+b+
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10 days ago
If `(b^2+c^2-a^2)/(2b c),(c^2+a^2-b^2)/(2c a),(a^2+b^2-c^2)/(2a b)` are in `A.P.` and `a+b+
