$\int\sin\left(8-4x\right)dx$
$\left(x+2\right)\left(x+8\right)-\left(x+5\right)^2+\:13$
$2xy'\:-\:y\:=3x^2$
$\int3\sec^{2}\left(x\right)dx$
$23^2\cdot10^{12}$
$\int\left(-2x^{4n}\right)dx$
$7+9+2b+7+5b+2$
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