1.

Which of the followintg is true if A+B+C = pi

Answer»

`sin 2A + SIN2B + sin 2C = 4 sinA sinB SINC`
`sinA + sinB + sinC = 4 cos'A/2 cos 'B/2 cos'C/2`
`cos 2A + cos 2B + cos 2C = - 1- 4 cos A cos B cos C`
`cos A + cos B + cos C = 1 + 4 sin 'A/2 sin 'B/2 sin 'C/2`

Answer :A


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