1.

cos 22^(@)+cos 78^(@)+cos80^(@)=

Answer»

`4sin 11^(@)sin 39^(@)sin 40^(@)`
`1+4cos 11^(@)cos 39^(@)cos 40^(@)`
`1+4sin 11^(@)sin 39^(@)SIN40^(@)`
`4 cos 11^(@)cos 39^(@)cos 40^(@)`

ANSWER :C


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