If f(x), defined \(f(x)=\left\{\begin{array}{lll} k x+1 & \text { if } & x \leq \pi \\ \cos x & \text { if } & x>\pi \end{array}\right.\) is continuous at x = π, then the value of k is : 

1
0
2
π
3
\(\frac{2}{\pi}\)
4
\( -\frac{2}{\pi}\)

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