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posted by elis on Tuesday, July 19, 2011 at 3:19pm.
differentiate y=-4x^2cos x. i need to know the calculation work. (ans: 4x^2sinx - 8xcosx)
use the product rule y = (-4x^2)(cosx_ dy/dx = (-4x^2)(-sinx) + (-8x)(cosx) = 4x^2sinx - 8xcosx
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