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anonymous

  • 5 years ago

can someone walk me through the final step of trig substitution?

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  1. anonymous
    • 5 years ago
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    calc?

  2. anonymous
    • 5 years ago
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    as in the step where you take the sin(theta) or whatever trig you're using and apply it to a triangle

  3. anonymous
    • 5 years ago
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    yep. calc2

  4. anonymous
    • 5 years ago
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    sorry, brb

  5. anonymous
    • 5 years ago
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    How about giving us the question, or at least how far you are?

  6. anonymous
    • 5 years ago
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    \[\int\limits \sqrt{25x^2-4}/x dx\]

  7. anonymous
    • 5 years ago
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    and i'm looking for how to to use a triangle to do the final substitution

  8. anonymous
    • 5 years ago
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    let x=5 tan theta

  9. anonymous
    • 5 years ago
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    scratch that x=5 sec theta. Is this what you are looking for or are you at another part of the problem?

  10. anonymous
    • 5 years ago
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    Scratch that x=2 sec theta. Sorry the 25 distracted me.

  11. anonymous
    • 5 years ago
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    the very end. after the trig has been integrated, and you go to substitute variables back in for theta

  12. anonymous
    • 5 years ago
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    after integration i have 2(tan(theta)-theta)

  13. anonymous
    • 5 years ago
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    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

  14. anonymous
    • 5 years ago
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    ah that should work. thanks

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