A. \(\left( {6x - 2} \right){\left( {3{x^2} - 2x + 1} \right)^{ - {\textstyle{3 \over 4}}}}\)
B. \(\frac{{\left( {3x - 1} \right){{\left( {3{x^2} - 2x + 1} \right)}^{ - {\textstyle{3 \over 4}}}}}}{2}\)
C. \(\left( {3x - 1} \right){\left( {3{x^2} - 2x + 1} \right)^{ - {\textstyle{3 \over 4}}}}\)
D. \(\frac{{\left( {3x - 1} \right){{\left( {3{x^2} - 2x + 1} \right)}^{ - {\textstyle{3 \over 4}}}}}}{4}\)
B
\(\begin{array}{l}
y' = \frac{1}{4}{\left( {3{x^2} - 2x + 1} \right)^{ - \frac{3}{4}}}.{\left( {3{x^2} - 2x + 1} \right)^\prime }\\
= \frac{1}{4}{\left( {3{x^2} - 2x + 1} \right)^{ - \frac{3}{4}}}.\left( {6x - 2} \right)\\
= \frac{{\left( {3x - 1} \right){{\left( {3{x^2} - 2x + 1} \right)}^{ - {\textstyle{3 \over 4}}}}}}{2}
\end{array}\)
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