Write the function in the form y = f(u) and u = g(x). Then find dy/dx as a function of x.y = cot(9x - 6)
A. y = cot u; u = 9x - 6; 
= - 9 cot(9x - 6) csc(9x - 6)
B. y = 9u - 6; u = cot x; 
= - 9 cot x csc2 x
C. y = cot u; u = 9x - 6; 
= - csc2(9x - 6)
D. y = cot u; u = 9x - 6; 
= - 9 csc2(9x - 6)
Answer: D
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