If sin^2 A/2 +sin^2 B/2 + sin^2 C/2 = 1-2 sinA/2 sinB/2 sinC/2 then prove that sin^2 A/2 + sin^2 B/2 +sin^2 C/2 >= 3/4
If sin^2 A/2 +sin^2 B/2 + sin^2 C/2 = 1-2 sinA/2 sinB/2 sinC/2 then prove that sin^2 A/2 + sin^2 B/2 +sin^2 C/2 >= 3/4
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