$x^2-x-42$
$\int_0^3\left(\frac{1}{\sqrt{36-x^2}}\right)dx$
$12x^2+28x+15x+35$
$-4-15\cdot15$
$\frac{sec^2x+3secx-4}{4secx-4}=\frac{secx+4}{4}$
$\lim_{x\to\infty}\left(-\frac{x}{x+\sqrt{x^2+x}}\right)$
$16m^2-40m^4+20m^6$
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