Question:
Mark $(\sqrt{)}$ against the correct answer in the following:
The function $f(x)=4-3 x+3 x^{2}-x^{3}$ is
A. decreasing on $\mathrm{R}$
B. increasing on $\mathrm{R}$
C. strictly decreasing on $R$
D. strictly increasing on $R$
Solution:
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