1.

For what values of k the equation sin x + cos (k + x) + cos ( k - x) = 2has real solution ?

Answer»

`N pi - (pi)/(6) le K le n pi + (pi)/(6), n in Z`
`n pi + (pi)/(3) le k le n pi - (pi)/(3), n in Z`
`n pi + (pi)/(2) le k le n pi - (pi)/(2), n in Z`
`n pi + (pi)/(4) le k le n pi - (pi)/(4), n in Z`

Answer :A


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