$\int4x\:\cdot\:e^{2x}dx$
$4x\:+7\:y\:-\:42\:=\:0\:$
$\left(260-x\right)^2$
$\lim_{x\to\infty}\left(\sqrt{x+3}-\sqrt{x}\right)$
$\left(4a\:+\:6b\:-\:8z\right)\:\left(4a\:-\:6b\:+\:8z\right)$
$\left(2r+q\right)^2-6\left(2r+q\right)+9$
$\left(4m-3.5n\right)^3$
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