$a^2-b^2\:c^4$
$\lim_{x\to0}\frac{sen3x\left(1-cos3x\right)}{x^2}$
$10x^2+4x+5x^2-x^2$
$2x^3-7x^2+8x-3$
$\lim_{x\to1}\left(\frac{x^3-3x-4}{x^2-3x+2}\right)$
$1,200+2,00$
$\left(-18\right)^3$
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