$\int_4^{\infty}\left(\frac{1}{x^2-\frac{b}{a}}\right)dx$
$2x^3+5x-3\:;\:x=1$
$\int x^3\left(x+1\right)dx$
$a=2;b=5;c=-3;d=-1;f=0$
$\lim_{x\to0}\left(\frac{3x}{2\sqrt{x+9}-6}\right)$
$-9w+5-8w-4$
$\lim_{x\to3}\left(\frac{\sqrt{x-7}-2}{x+3}\right)$
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