If f(x) =kx3-9x2+9x+3 is monotonically increasing in each interval, thenA) kB) k<=3C) k>3D) k>=3
If f(x) =kx3-9x2+9x+3 is monotonically increasing in each interval, then
A) k
B) k<=3
C) k>3
D) k>=3
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