$2ab+a^3b^2+1;\:a=1;\:b=-3$
$\left(\frac{2}{b}\right)^{-2}$
$x^{2}-\frac{14}{15}x-\frac{8}{15}=0$
$\int\frac{1}{4}y\cos y^2dy$
$\frac{x+3}{x^2+x-6}$
$-7+3-1+2$
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