$\lim_{x\to\infty}\left(\sqrt{x^2+qx}-\sqrt{x^2+rx}\right)$
$cos\:=-\frac{4}{5}$
$6x^2-10x-4<0$
$29y^2+33y^2+25y^2+y^2+13y^2+55y^2$
$\left(5m^5-9n^2\right)^4$
$\frac{432}{0.071}$
$\left(5b\right)^{-2}$
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