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Originally Posted by .::MadMaX::. Yes, both sine and cosine are periodic with period [ math]2\pi[/tex] so 1) $\displaystyle cos(14\pi)= cos(7(2\pi))= cos(2\pi)= cos(0)= 1$ and 2 $\displaystyle sin(14\pi)= sin(7(2\pi))= sin(\pi)= sin(0)= 0$.
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!
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