$\int\frac{1}{a^2-x^2}dx$
$\left(2x-21\right)^3$
$\frac { t - x } { x }$
$2\:cot^2\:x-5=0$
$\int xcos3x\:dx$
$0.4x^2y-0.7xy^2+1.2x^2y-2.4x^2y-0.2xy^2$
$1111\cdot2552$
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