1) x^{3}+x^{2}+3x\sqrt{x+1}>0
2) x+\sqrt{1-x^{2}}\leq x\sqrt{1-x^{2}}
Edited by yeutienyeudoi, 26-04-2014 - 08:55.
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Posted 26-04-2014 - 08:52
yeutienyeudoi
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