Calculate the given derivative. Simplify the answer.
#[Let][Sea]# $\displaystyle %3[0]=%7$.
#[Then][Entonces]# $\displaystyle %5 =$ BOX*
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#[Let][Sea]# $\displaystyle %4[0]=%8; \ %4[1]=%9;$
#[Then][Entonces]# $\displaystyle %6 =$ BOX*
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