$\sqrt{8+\sqrt{15x}}\sqrt{8-\sqrt{15x}}$
$\left(-29\right)-\left(-42\right)$
$20f^{4\:}-60f^3+4f^2$
$\frac{18}{3}-1$
$9-\left\{5-4+\left(-2\right)\right\}$
$\int5x-7\:dx$
$\lim_{x\to\infty}\left(\frac{cos\left(\frac{4}{x}\right)}{x^{-2}}\right)$
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