1.

If A+B+C=(3pi)/(2), prove that cos 2A+ cos 2B+ cos 2C=1-4 sin A sin B sin C .

Answer»

`1-4 SIN A sin B sin C `
`1-4 cos A cos B cos C `
`4 sin A sin B sin C `
`1+ 2 cos A cos B cos C `

ANSWER :A


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