IN ∆ABC , Prove that sin^2 A/2+ sin^2 B/2+ sin^2 C/2 =1-2sin A/2 sinB/2 sinC/2

IN ∆ABC , Prove that sin^2 A/2+ sin^2 B/2+ sin^2 C/2 =1-2sin A/2 sin

1.	IN ∆ABC , Prove that sin^2 A/2+ sin^2 B/2+ sin^2 C/2 =1-2sin A/2 sinB/2 sinC/2
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