$-90-45-37$
$-15\:_+\:\left(-12\right)\:-4\:-\left(-8\right)$
$\int e^{\frac{4x}{3}}\:dx$
$\frac{dy}{dx}=\frac{6y^2-xy-6x^2}{5xy}$
$t^2+t-2$
$\left(4+5\right)^2+\left(7-3\right)^2-\left(8+1\right)^2$
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