# Simple complex number question

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• Jan 20th 2010, 06:43 AM
.::MadMaX::.
Simple complex number question
• Jan 20th 2010, 07:17 AM
HallsofIvy
Quote:

Originally Posted by .::MadMaX::.

Yes, both sine and cosine are periodic with period [ math]2\pi[/tex] so
1) $cos(14\pi)= cos(7(2\pi))= cos(2\pi)= cos(0)= 1$ and
2 $sin(14\pi)= sin(7(2\pi))= sin(\pi)= sin(0)= 0$.
• Jan 20th 2010, 07:23 AM
.::MadMaX::.
I wasn't so sure about that,because in the book says they are both 0,so I posted question here just to be sure :) Thanks HallsofIvy!