See here for very similar... http://www.mathhelpforum.com/math-he...tml#post658188
See here for very similar... http://www.mathhelpforum.com/math-he...tml#post658188
... or, better still, this... integrate e^(-2t) cos(t) - Wolfram|Alpha
Then look at my first link, but I'll draw similar for exactly the present problem. Give me two ticks.
Just in case a picture helps...
Larger
... where (key in spoiler) ...
Spoiler:
PS: There's a button on the Wolfram page that say's 'show steps'.
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Don't integrate - balloontegrate!
Balloon Calculus; standard integrals, derivatives and methods
Balloon Calculus Drawing with LaTeX and Asymptote!
Oh! I see! That's one of those tricks where you do integration by parts until you get a duplicate term, toss that on the other side to combine with the original integration and then divide out the coefficient.
I didn't see that at first. Thanks guys!