Question: pleasehelp witb my calc homework Consider the equation below. (If an answer does not exist, enter DNE.) [ f(x)=x^{3}-3 x^{2}-9 x+4 ] (a) Find the

pleasehelp witb my calc homework Consider the equation below. (If an answer does not exist, enter DNE.) \[ f(x)=x^{3}-3 x^{2}-9 x+4 \] (a) Find the interval on which \( f \) is increasing. (Enter your answer using interval notation.) 2 answers

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