1.

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

Answer»

`n PI -(pi)/6 le k le n pi+(pi)/6, n in Z`
`npi+(pi)/3le k le n pi -(pi)/3, n in Z`
`n pi+(pi)/2 le k le n pi -(pi)/2, NINZ`
`n pi +(pi)/4 le k le n pi-(pi)/4, n in Z`

ANSWER :A


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