$\lim_{x\to-\infty}\left(\frac{\sqrt{5x^2-2}}{x+3}\right)$
$9x^2-42x\:+21$
$5^2.\:5^{sen\:x}$
$\left(3x+3\right)\left(3x+8\right)\left(5x-3\right)$
$\:y^2+1+2y^2$
$xp\frac{8^{x}-2^{x}}{h^{x}-z^{x}}$
$\frac{m}{6}+4=13$
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