How can I solve $\frac{2x}{\sqrt{1-x^2}}=0$

Question

This is what I could come up with:

$\dfrac{2x}{\sqrt{1-x^2}}=0$

$\left(\dfrac{2x}{\sqrt{1-x^2}}\right)^2=0^2$

$\dfrac{4x^2}{1-x^2}=0$

I can't go forward from this point because of that stupid 0! Any help is appreciated!

Answer 1

Hints:

$$\text{For any well-defined algebraic fraction}\;\;\frac ab\;,\;\;\text{we have that}\;\frac ab=0\iff a=0$$