$x\:\cdot2x$
$y'-y=2x$
$3x\:+\:6\:+\:6x\:+\:5\:-\:2\:-\:x$
$9^2+30n+25$
$\left(2x-4y^2\right)^2\left(2x+4y^2\right)$
$\frac{1}{\tan\left(y\right)+\cot\left(y\right)}=\sin\left(y\right)\cos\left(y\right)$
$3x^3-6x^2+4x-2\cdot x^3-3x+1$
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