1.

If A+B+C=180^@ thensin^(3) A cos (B-C) + sin^(3)B cos(C-A)+ sin^(3) C cos (A-B)=

Answer»

`2 SIN A sin B cos C `
`3 sin A cos B sin C `
`2 cos A cos B cos C `
`3 sin A sin B sin C `

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