Which of the following functions is uniformly continuous on (0,1)(0, 1)(0,1)?
f(x)=x2f(x) = x^2f(x)=x2
f(x)=1xf(x) = \frac{1}{x}f(x)=x1
f(x)=sin(1/x)f(x) = \sin(1/x)f(x)=sin(1/x)
f(x)=1x2f(x) = \frac{1}{x^2}f(x)=x21