Calculus

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Find the intervals on which x^2/(x-3)^2 is decreasing.

a. (0,6)
b. (0,3), (3,6)
c. (-inf,0), (6,inf)

The critical numbers are x=0 and 6, but since there is an asymptote at x=3, I'm not sure whether a or b is the answer.

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