If A+B+C = then prove that sin 2A + sin 2B-sin 2C = 4 cos A cos Bsin C #eduacademia

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Formulae
1. sin 2A = 2sinA.cosA
2. sinC - sinD = 2cos[(C+D)/2].sin[(C-D)/2]
3. sin(A+B) - sin(B-C) = 2cosA.sinB

Note
Here dot (.) represents Multiplication (×)

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