$180\infty$
$16x^2+x+16$
$\lim_{x\to\frac{2}{3}}\left(\frac{\left|-3x+2\right|}{18x^2-8}\right)\:$
$\frac{88x^2y^7}{2xy^5}$
$\frac{sena-sen^2a}{cos^2a}=\frac{1}{csc^2a}$
$x^2+15x+36$
$- 2 x ^ { 3 } y ^ { 3 } + x y$
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