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10/27/08
Fynl
Fynl
Hey Anthony sorry to bug you I just had a math question. How do you use trig subsitution?
Basically all my teacher taught us was that if you have (a^2 - x^2), use asinO (O = theta), (a^2 + x^2), use atanO, and (x^2 - a^2), use asecO. i really have no idea how that applies, and what those are "used" for or in. Do you replace the (a^2 +- x^2) with the trig function? Or do you substitute just the x?
I've tried doing it like a U substitution, but I don't know where the dO (d theta) comes from. I'm just completely clueless as to how all this works. The textbook explains in a way that assumes we have a slight idea of whats going on with the trig substitution (which I don't) and my teacher literally refuses to explain on the basis that "you should have learned this in junior high".
Basically all my teacher taught us was that if you have (a^2 - x^2), use asinO (O = theta), (a^2 + x^2), use atanO, and (x^2 - a^2), use asecO. i really have no idea how that applies, and what those are "used" for or in. Do you replace the (a^2 +- x^2) with the trig function? Or do you substitute just the x?
I've tried doing it like a U substitution, but I don't know where the dO (d theta) comes from. I'm just completely clueless as to how all this works. The textbook explains in a way that assumes we have a slight idea of whats going on with the trig substitution (which I don't) and my teacher literally refuses to explain on the basis that "you should have learned this in junior high".
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