$12x-5x+12x$
$3\tan^2a=1$
$\int\left(1-t\right)\left(2+t\right)^2dt$
$7x-11\le4x$
$6x\:+\:18\:<\:72$
$4+1^4-1+2$
$y=\frac{2}{x}+\frac{3}{x^3}$
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