1.

If A+ B+C= 180^(@) " then " cos 2A+ cos 2B + cos 2C+ 1=

Answer»

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

ANSWER :A


Discussion

No Comment Found

Related InterviewSolutions