For what value of k the equation sinx+co...

For what value of `k` the equation `sinx+cos(k+x)+cos(k-x)=2` has real solutions?

A

`x=n pi , a in R , n in I`

B

` =(4n+1)(pi)/(2),a in R n in I`

C

`x=1/2sin^(-1)(4(a+1))/(a^(2)),a in (-infty,2-2sqrt(2)]mu[2+2sqrt(2),infty)-(-1)`

D

none of these

Verified by Experts

The correct Answer is:

a,b,c,d

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