Unformatted text preview: 9. Z sec 2 x csc 2 x dx ⇒ 10. Z tan 3 x sec x dx ⇒ 8.3 Trigonometric Substitutions So far we have seen that it sometimes helps to replace a subexpression of a function by a single variable. Occasionally it can help to replace the original variable by something more complicated. This seems like a “reverse” substitution, but it is really no diﬀerent in principle than ordinary substitution....
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 Spring '07
 JonathanRogawski
 Math, Calculus, Trigonometry, dx

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