$\frac{9^2}{4}+ab+b^2$
$-.-1+4\cdot2+3\cdot2$
$\left(3t^7-m^2n^3\right)\left(3t^7+m^2n^3\right)$
$\left(x-8\right)\left(x+17\right)$
$216-\frac{120}{-6}$
$-tan^2\left(x\right)=1-tan^2\left(x\right)csc^2\left(x\right)$
$\int\frac{2x^3-2x^2-1}{x^2-x}dx$
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