$\frac{28st}{-4t}$
$\frac{9+8cos\left(x\right)}{8+9sec\left(x\right)}$
$64m^9-216$
$\int\frac{\left(x+2\right)}{x^2+4}dx$
$-16x^{2}+54x-18$
$\left(\frac{5}{4}x^a+\frac{3}{5}y^2\right)\left(\frac{5}{4}x^a-\frac{3}{5}y^2\right)$
$-1250+3600$
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