Write the function in the form y = f(u) and u = g(x). Then find dy/dx as a function of x.y = cos3 x
A. y = cos u; u = x3; 
= - 3x2 sin(x3)
B. y = u3; u = cos x; 
= 3 cos2 x sin x
C. y = u3; u = cos x; 
= - 3 cos2 x sin x
D. y = cos u; u = x3; 
= - sin(x3)
Answer: C
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