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Math Help - integrating..

  1. #1
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    integrating..

    Hi,

    how do you go about integrating this:

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

    Thanks
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  2. #2
    Member Nacho's Avatar
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    Santiago, Chile
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    <br />
\sin (x)\cos (y) = \frac{{\sin \left( {x - y} \right) + \sin \left( {x + y} \right)}}<br />
{2}<br />

    can you continue?
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  3. #3
    Member RedBarchetta's Avatar
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    Well, assuming n is a constant, then use this rule to split the integral up into something more manageable.

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

    Let m=1 and n=n.
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  4. #4
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    thank you guys.. i can do it now!

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