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tmagloire1

  • one year ago

Can anyone help with this AP Calculus AB problem? Here is the picture of the question. Thanks in advanced http://prntscr.com/7u6a4c

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  1. anonymous
    • one year ago
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    do you know the product rule?

  2. tmagloire1
    • one year ago
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    yes u'v(uv')

  3. anonymous
    • one year ago
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    you add them :) \[\frac{ d(uv) }{ dx }=u'v+uv'\]

  4. anonymous
    • one year ago
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    So you can let u = x and v = sin x

  5. tmagloire1
    • one year ago
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    Ohh and if i get xsinx than its true

  6. anonymous
    • one year ago
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    Looks like its asking you to take the 3rd derivative of x sin x and if that matches the stuff on the right it's true

  7. tmagloire1
    • one year ago
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    oh okay ill try it

  8. tmagloire1
    • one year ago
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    I got -3sinx+xcosx

  9. tmagloire1
    • one year ago
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    so its false

  10. anonymous
    • one year ago
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    I got -3 sin x - x cos x

  11. tmagloire1
    • one year ago
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    Oh I must have missed the negative

  12. tmagloire1
    • one year ago
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    So it would be true than

  13. anonymous
    • one year ago
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    yes

  14. tmagloire1
    • one year ago
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    Thank you so much!

  15. anonymous
    • one year ago
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    yw

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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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