Let $\displaystyle {y}={1.25}{x}^{{4}}+{3.25}$ and $\displaystyle {\frac{{{\left.{d}{x}\right.}}}{{{\left.{d}{t}\right.}}}}={0.6}$.
Find $\displaystyle {\frac{{{\left.{d}{y}\right.}}}{{{\left.{d}{t}\right.}}}}$ when $\displaystyle {x}={2}$.

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