For f(x)={sinxxx≠0kx=0f(x) = \begin{cases} \frac{\sin x}{x} & x \neq 0 \\ k & x = 0 \end{cases}f(x)={xsinxkx=0x=0 to be continuous at x=0x=0x=0, what must kkk equal?
111
000
π\piπ
1π\frac{1}{\pi}π1