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Math Help - Please Check my Answer Derivative

  1. #1
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    Please Check my Answer Derivative

    I worked the problem out twice and got the same answer both times. I think that it is right.

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  2. #2
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    Three comments:
    1) The second answer you wrote is correct.

    2) There is a negative sign missing in your first solution when you took the derivative of csc(x).

    3) Some of your notation leaves something to be desired. In both solutions you wrote:
    d/dx[3x^2] * d/dx[-4x^2] * y
    to mean the result:
    6x - 8xy

    The actual result is:
    d/dx[3x^2] * d/dx[-4x^2] * y = (6x)*(8x)*y = 48(x^2)y

    You really need to write:
    d/dx[3x^2] - d/dx[4x^2] * y

    -Dan
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  3. #3
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    Re:

    DAN you are the MAN!!!!!!!!!!!!!!!!!
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