Trig substitution (integration)

  • Thread starter joess
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  • #1
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Homework Statement


30x75o8.gif


Homework Equations



The Attempt at a Solution


I'm not asking for someone to do the question for me but I was just wondering what I'm supposed to sub in. Do I put in
2pyuz2w.gif
as if it was (x^2-9)^(1/2) or do I have to do something differently if there is a constant in front of the x^2? Thanks for any help.
 

Answers and Replies

  • #2
You are correct, secant is the correct trig function to use in this case.
However the coefficient is incomplete, you need to divide out the 4 as well.
 
  • #3
16
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So is it x=(3/2)sec(theta) ?
 
  • #4
TD
Homework Helper
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That's right! :)
 

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