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Posted by on Tuesday, July 19, 2011 at 3:19pm.

differentiate y=-4x^2cos x. i need to know the calculation work. (ans: 4x^2sinx - 8xcosx)

  • math - , Tuesday, July 19, 2011 at 3:25pm

    use the product rule

    y = (-4x^2)(cosx_

    dy/dx = (-4x^2)(-sinx) + (-8x)(cosx)
    = 4x^2sinx - 8xcosx

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