$\int\sqrt{3x^2-1}dx$
$\int\frac{21}{x^2\sqrt{x^2+81}}dx$
$5^2\:x\:z^2$
$\left(4x^3+3xy+8y^2\right)\left(4x^3-3y-8xy^2\right)$
$10-\left(-7+5\right)$
$\frac { - t ^ { 3 } + 3 t ^ { 2 } - 9 t } { 4 }$
$25-\left|4-\left(3-9\right)\right|$
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