$\int13sec^4xtan^2xdx$
$\frac{2x^2+4x-3}{2}$
$\left(47\right)\cdot\left(88\right)\cdot\left(-78\right)\cdot\left(-20\right)$
$4a^2-3a-a^2+5a$
$e^{2x}\frac{dy}{dx}=y-ye^{3x};\:y\left(0\right)=1$
$0.10x+0.15\left(3000-x\right)\:=\:327$
$2\cdot8+4\cdot3+9\cdot6+5$
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