$\int_0^{\infty}x^kdx$
$-250-646$
$5ax\:=3$
$\int\frac{\left(\left(x^3\right)+\left(3x^2\right)-\left(9x\right)-\left(2\right)\right)}{x-2}dx$
$f\left(x\right)=\frac{2}{1-x^7}$
$\int\frac{sin\left(42x\right)}{1+cos^2\left(42x\right)}dx$
$x^2-3x=8$
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