Derivative of Inverse Sine Function

Which of the following equations correctly represent the derivative of $\arcsin(x)$ with respect to $x$?

I. $\frac{d}{dx}\arcsin(x) = \frac{1}{\sqrt{1-x^2}}$

II. $\frac{d}{dx}\arcsin(x) = \frac{1}{\sqrt{1- x*x}}$

III. $\frac{d}{dx}\arcsin(x) = \frac{1}{\sqrt{(1-x)(1+x)}}$