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    How To Find The Integral of Sin x dx?

    This is obtained by using http://en.wikipedia.org/wiki/Euler's_formula]Euler's[/PLAIN] [Broken] formula and trigonometric identities \sin(-x)=-\sin(x) and \cos(-x)=\cos(x). By knowing that \frac{d}{dx}e^{kx}=ke^{kx}, you can work out the integral by yourself. But memorizing simple derivatives...
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