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

math 
Reiny
use the product rule
y = (4x^2)(cosx_
dy/dx = (4x^2)(sinx) + (8x)(cosx)
= 4x^2sinx  8xcosx
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