

[tex]A=(\frac{\sqrt{1+x}}{\sqrt{1+x}-\sqrt{1-x}})(\sqrt{\frac{1}{x^{2}}-1}-\frac{1-x}{x})\frac{x}{1-x+\sqrt{1-x^{2}{}}}[/tex]
1- Rút gọn a
2- Chứng minh khi x>0 thì A>0
help me please!!!!!!!!!!!!!!!!!!!!!!!!!!!






1- Rút gọn a
2- Chứng minh khi x>0 thì A>0
help me please!!!!!!!!!!!!!!!!!!!!!!!!!!!
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