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Knowledge Is Power

Knowledge Is Power

Member Since 21-08-2013
Offline Last Active 09-09-2013 - 10:28
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#446360 $\frac{cos x}{(cos x - sin x)sin^2x}> 8$

Posted by Knowledge Is Power on 30-08-2013 - 20:24

 Cho $0 < x < \frac{\Pi }{4}$. Chứng minh rằng:

$\frac{cos x}{(cos x - sin x)sin^2x}> 8$

 

 




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