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November 15th, 2016, 05:58 AM   #1
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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.
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November 15th, 2016, 06:53 AM   #2
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$\sin(\pi/4) = \cos(\pi/2 - \pi/4)= \cos(\pi/4)$

$\sin^2(\pi/4) + \cos^2(\pi/4) = 1 \implies 2\sin^2(\pi/4) = 1$, etc.
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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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