$2x+xy+2y=2$
$\cot\theta\sen\theta=\cos\theta$
$\int\frac{1}{\left(3x-4\right)\left(5x+2\right)}dx$
$\left(4x^4-x\right)\left(-2x^5-5\right)$
$\frac{\left(5x^3-4x^2-11x-2\right)}{\left(x-3\right)}$
$-7x+\:1^2-\:21$
$n^2-3n+28=0$
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