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If A+B-C = π , and sin 2 A+ sin 2 B- sin 2 C = ∂ sinAsinBcosC, then write the value of ∂.

If A+B-C = π , and sin2A+ sin2B- sin2C = ∂ sinAsinBcosC, then write the value of ∂.

Grade:11

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