$\int\frac{x^3e^{-2x^4}}{e^{-2x^4}+4}dx$
$\int x^3\:.\sin\left(3x^2\right)dx$
$\left|\left(-2\right)^5-\left(-3\right)^3\right|^2$
$\left(1-sinx\right)\left(1+cscx\right)\left(sinx\right)$
$y'\:=\:-\frac{x}{y},\:y\left(4\right)\:=\:3$
$4a^2-2ab$
$xy^2=12$
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