Find the derivative.y = x3 cos (8x2)
A. y' = - 16x4 sin (8x2) + 3x2 cos (8x2)
B. y' = 16x4 sin (8x2) + 3x2 cos (8x2)
C. y' = - 16x4 sin (8x2)
D. y' = sin (8x2) + 3x2 cos (8x2)
Answer: A
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B. y = 
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A. 
B. 
C. 
D. 
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A. 
B. 
C. 
D. 