anonymous
  • anonymous
can someone walk me through the final step of trig substitution?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
calc?
anonymous
  • anonymous
as in the step where you take the sin(theta) or whatever trig you're using and apply it to a triangle
anonymous
  • anonymous
yep. calc2

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anonymous
  • anonymous
sorry, brb
anonymous
  • anonymous
How about giving us the question, or at least how far you are?
anonymous
  • anonymous
\[\int\limits \sqrt{25x^2-4}/x dx\]
anonymous
  • anonymous
and i'm looking for how to to use a triangle to do the final substitution
anonymous
  • anonymous
let x=5 tan theta
anonymous
  • anonymous
scratch that x=5 sec theta. Is this what you are looking for or are you at another part of the problem?
anonymous
  • anonymous
Scratch that x=2 sec theta. Sorry the 25 distracted me.
anonymous
  • anonymous
the very end. after the trig has been integrated, and you go to substitute variables back in for theta
anonymous
  • anonymous
after integration i have 2(tan(theta)-theta)
anonymous
  • anonymous
Draw a triangle and put your stuff on a triangle. It is difficult to guide you in the middle of a problem and we don't know the work. Watch this tape. I watch it every time I have to do a trig sub. http://www.youtube.com/watch?v=CXKoCMVqM9s&feature=BFa&list=PL590CCC2BC5AF3BC1&index=25
anonymous
  • anonymous
ah that should work. thanks

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