$\lim\:_{x\to\:\:a}\left(\frac{tan^2\left(x-a\right)}{x^2-a^2}\right)$
$\frac{\left(x-1\right)}{\left(x^2-2x\right)}$
$\frac{2x-3}{x-2}\ge3$
$\left(144x^2y^4-81a^4b^2\right)$
$4x-11=1$
$-23\cdot93$
$\sen^{3}y^{3}\left(3x^{4}y\right)$
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