$2.\left(3+18\right)-\left(3+31\right):2$
$\int\frac{x+5}{x^3+x-2}dx$
$4^2+2^3-2^2-3^3$
$n\left(n-1\right)+3\left(n-1\right)$
$-90+65+7-9-11+16+67+15$
$\int x\cdot cos\left(10x\right)dx$
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