$\left(-9\right)+\left(-3\right)^2$
$\left(-2\right)\cdot5$
$\frac{1-x^3}{1-x}$
$\int\frac{\left(sinx\right)}{\left(2-cosx\right)^2}dx$
$\int\:\frac{x^2+2x+1}{x^4+6x^2+9}dx$
$24,89+13,14+13,67$
$-1+6-\left(-3\right)$
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