$-3\:-\:\left(-20\right)$
$f\left(x\right)=\left(t+4\right)^2\left(\left(t+4\right)-4\right)$
$xdx-\sqrt{a^2-x^2}dy=0$
$m+4m-1=24$
$2\csc^{2}x=3\cot^{2}x-1$
$-15a^2-24a^2$
$100x^8-1$
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