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El_Arrow

  • one year ago

stuck in arc length problem

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  1. El_Arrow
    • one year ago
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  2. El_Arrow
    • one year ago
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    @freckles

  3. El_Arrow
    • one year ago
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    how does it get the 2650/4 + 441x/4?

  4. El_Arrow
    • one year ago
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    im getting 1325/2 on my calculator

  5. anonymous
    • one year ago
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    |dw:1434600730609:dw|

  6. anonymous
    • one year ago
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    2650/4=1325/2

  7. El_Arrow
    • one year ago
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    but then why didnt the person put 1325/2 in the problem?

  8. anonymous
    • one year ago
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    it looks like they wanted to pull the 1/4 out from under the radical.

  9. El_Arrow
    • one year ago
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    oh i see

  10. El_Arrow
    • one year ago
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    one more thing

  11. El_Arrow
    • one year ago
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    what did he do here?

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  12. El_Arrow
    • one year ago
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    like how did he get the 3+y=(1/8)tangent(theta)?

  13. anonymous
    • one year ago
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    that's a trig substitution from right angle trig. basically if you have an integral of the form \[\sqrt{b^2+a^2x^2}\]you can make the substitution x = (a/b) tan Θ

  14. anonymous
    • one year ago
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    I reversed that. x = (b/a) tan Θ

  15. El_Arrow
    • one year ago
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    so the x is (3+y), the b is 1 and a is 8? right?

  16. anonymous
    • one year ago
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    yes

  17. El_Arrow
    • one year ago
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    okay thanks

  18. anonymous
    • one year ago
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    you're welcome

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spraguer (Moderator)
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is replying to Can someone tell me what button the professor is hitting...

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