November 15th, 2016, 05:58 AM  #1 
Member Joined: Aug 2016 From: South Korea Posts: 54 Thanks: 0  Trigonometric Limits
I'm actually having a hard time understanding Limits with Trigonometry. So I'll need to ask questions about that. For this given problem: asdf.jpg How did Sin(TT/4) and Cos(TT/4) became √2/2? Someone please explain to me how Limits with Trigonometry works TTTT Last edited by skipjack; November 15th, 2016 at 06:54 AM. 
November 15th, 2016, 06:53 AM  #2 
Global Moderator Joined: Dec 2006 Posts: 20,288 Thanks: 1968 
$\sin(\pi/4) = \cos(\pi/2  \pi/4)= \cos(\pi/4)$ $\sin^2(\pi/4) + \cos^2(\pi/4) = 1 \implies 2\sin^2(\pi/4) = 1$, etc. 
November 15th, 2016, 08:08 AM  #3  
Math Team Joined: Jul 2011 From: Texas Posts: 2,817 Thanks: 1460  Quote:
 

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