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December 24th, 2017, 08:58 AM  #1 
Senior Member Joined: Dec 2015 From: Earth Posts: 192 Thanks: 23  Proof Inequality
Show that $\displaystyle \; \sin k>k \frac{k^3 }{6}\; $ for $\displaystyle k\in N$

December 24th, 2017, 01:53 PM  #2 
Global Moderator Joined: Dec 2006 Posts: 18,416 Thanks: 1462 
Can you assume knowledge of the Maclaurin series for the sine function?


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inequality, proof 
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