integrating..

**hashi** · October 11th 2008, 04:11 PM

Hi,

how do you go about integrating this:

sin(t)*cos(n*t) with respect to t?

Thanks

**Nacho** · October 11th 2008, 04:58 PM

$ \sin (x)\cos (y) = \frac{{\sin \left( {x - y} \right) + \sin \left( {x + y} \right)}} {2} $

can you continue?

**RedBarchetta** · October 11th 2008, 04:59 PM

Well, assuming n is a constant, then use this rule to split the integral up into something more manageable.

$ \sin (mx)\cos (nx) = \frac{1} {2}\left[ {\sin (m - n)x + \sin (m + n)x} \right] $

Let m=1 and n=n.

**hashi** · October 11th 2008, 05:19 PM

thank you guys.. i can do it now!

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