$\int\frac{x^2+x+1}{x^2-2x-8}dx$
$sinx=-\frac{2}{3}$
$\int_0^x\frac{cos\left(t\right)}{t}dt$
$5\:+\:9y\:-\:7\:-\:8y\:$
$\int\frac{1}{x^2-x-3}dx$
$2.16-87.23$
$2a+7^2$
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