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 November 15th, 2016, 05:58 AM #1 Member   Joined: Aug 2016 From: South Korea Posts: 53 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 TT-TT Last edited by skipjack; November 15th, 2016 at 06:54 AM.
 November 15th, 2016, 06:53 AM #2 Global Moderator   Joined: Dec 2006 Posts: 19,885 Thanks: 1835 $\sin(\pi/4) = \cos(\pi/2 - \pi/4)= \cos(\pi/4)$ $\sin^2(\pi/4) + \cos^2(\pi/4) = 1 \implies 2\sin^2(\pi/4) = 1$, etc.
November 15th, 2016, 08:08 AM   #3
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 How did Sin(TT/4) and Cos(TT/4) became √2/2?

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