$\cos^2x+\tan x\cos x=1$
$\lim_{x\to0}\left(\frac{\ln\left(-3x+1\right)x}{x}\right)$
$\int x\cdot e^{\frac{1}{3}x}dx$
$\frac{x^3+3x^2+3x+1}{x}$
$9b^2+36b+36$
$cos\frac{x}{2}=-\frac{\sqrt{3}}{2}$
$x^2-81=144$
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