Write the function in the form y = f(u) and u = g(x). Then find dy/dx as a function of x.y = cos4 x
A. y = u4; u = cos x; 
= 4 cos3 x sin x
B. y = cos u; u = x4; 
= - sin(x4)
C. y = cos u; u = x4; 
= - 4x3 sin(x4)
D. y = u4; u = cos x; 
= - 4 cos3 x sin x
Answer: D
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