$\lim_{x\to0}\left(\frac{3x^2}{\sin^2\left(x\right)}\right)$
$\frac{x-6}{x\left(x+y\right)}$
$5cos-3=2-2sen^2$
$\frac{12xy^2-10x^3y^5}{-4x^5y^2}$
$\frac{1}{x\sqrt{2+9x^2}}$
$-w+8\left(5+w\right)$
$\sqrt{3}\cot\:x-3=0$
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