$\frac{da}{dx}=x-\frac{1}{5}a$
$3x\cdot\left(x^2-1\right)$
$21-\left(-17\right)$
$\left(3\right)\left(x\right)\left(-8y^3\right)$
$m^4+2m^2+4$
$1\:+\:\tan^2\:=\frac{5}{4}$
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