$\lim_{x\to-\infty}\sqrt{2x^2+4}-\sqrt{5x^2-5}$
$k^2+7k$
$\int-9x\cos\left(5x\right)dx$
$\frac{dy}{dx}-cos\left(x+y\right)=0$
$a^3+9b^3+3\left(a^2b+ab^2\right)$
$121\:+\:176y\:+\:64y^2$
$i^2+4i+4$
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