Which of the following functions has a removable singularity at x=0x=0x=0?
f(x)=sin(1/x)f(x) = \sin(1/x)f(x)=sin(1/x)
f(x)=sinxxf(x) = \frac{\sin x}{x}f(x)=xsinx
f(x)=e1/xf(x) = e^{1/x}f(x)=e1/x
f(x)=1/x2f(x) = 1/x^2f(x)=1/x2