Which of the following functions are continuous for all real numbers?
f(x)=∣x∣f(x) = |x|f(x)=∣x∣
f(x)=1xf(x) = \frac{1}{x}f(x)=x1
f(x)=sin(x)f(x) = \sin(x)f(x)=sin(x)
f(x)=xf(x) = \sqrt{x}f(x)=x