1−x2\sqrt{1-x^{2}}1−x2
1−x2x\frac{\sqrt{1-x^{2}}}{x}x1−x2
x1−x2\frac{x}{\sqrt{1-x^{2}}}1−x2x
11−x2\frac{1}{\sqrt{1-x^{2}}}1−x21