"71xx8.(x)=\frac{x}{\sqrt{1-x^{2}}}, \quad x(x)=\frac{x}{\sqrt{1+x^{2} – InterviewSolution

1.	"71xx8.(x)=\frac{x}{\sqrt{1-x^{2}}}, \quad x(x)=\frac{x}{\sqrt{1+x^{2}}}
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