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 = cos u; u = x4 = - 4x3 sin(x4)
B. y = u4; u = cos x;  = - 4 cos3 x sin x
C. y = u4; u = cos x;  = 4 cos3 x sin x
D. y = cos u; u = x4 = - sin(x4)


Answer: B

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