$\lim_{x\to3}\left(\frac{4x^2-36}{x^2+9}\right)$
$2x^2+xy^3=17$
$\frac{\left(\left(a^4\right)\left(x^2\right)\right)}{ax^2}$
$sen^2a\left(1-sen\:a\right)$
$3\left(x\right)\left(-2\right)^2$
$x^2-20<9x-34$
$\log\sqrt{x^2-6x}=3$
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