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    jetblack2479's Avatar
    jetblack2479 Posts: 5, Reputation: 1
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    #1

    Jul 15, 2007, 12:21 AM
    Calculus differential equations
    Solve the following differential equations:

    a) dy/dx=24x(3x^2+9)^2

    b) dy/dx=2sin(3x+infinity) infinity is a constant

    I have done question (a) and got 216x^5+1296x^3+1944x as the answer. I don't know if this is correct.

    I have no clue how to do (b).

    Please help!!
    s_cianci's Avatar
    s_cianci Posts: 5,472, Reputation: 760
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    #2

    Jul 15, 2007, 07:47 PM
    Double-check your answer for a). A simple u-substitution will do the trick. For b), also a u-substitution ; let u = (3x + infinity).
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