Calculate the given derivative. Simplify the answer.
#[Let][Sea]# $\displaystyle %0[0]=%1; \ %0[1]=%2;$
$\displaystyle \frac{d%0[0]}{d%0[2]} =$ BOX*
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#[Let][Sea]# $\displaystyle %6[0]=%7; \ %6[1]=%8;$
$\displaystyle \frac{d%6[0]}{d%6[2]} =$ BOX*
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