I keep a filters book in my desk.
http://www.amazon.com/Passive-Activ...=sr_1_1?s=books&ie=UTF8&qid=1335897758&sr=1-1
http://www.amazon.com/Passive-Activ...=sr_1_1?s=books&ie=UTF8&qid=1335897758&sr=1-1
Trig is acceptable, now if you would have said differential equations or PChem, well then....................................................................
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