$\int\frac{-30}{x^2\sqrt{x^2+4}}dx$
$1^23$
$\lim_{x\to-\infty}\left(\frac{5x-2x^2+1}{x\left(3+x^2\right)}\right)$
$\frac{\left(-1\right)^n}{n^4\cdot2^{2n}}\cdot x^n$
$x^2+20x=-75$
$6b.4-5b$
$\lim_{x\to4}\left(\frac{k^2-16}{\sqrt{k\:}-2}\right)$
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