$18x^4+32x^2$
$y^2-10xy+25x^2$
$\lim_{x\to0}\left(\frac{5t^2+7t-sen\left(7t\right)}{t^2-3t+sen\left(3t\right)}\right)$
$\int\left(x^2\sqrt{6x+7}\right)dx$
$6\left(13a-\frac{9}{11}b^{3}\right)\cdot\left(13a+\frac{9}{14}b^{3}\right)$
$\frac{5-4x^2}{x^4-2x^2+8}$
$4x+6x^2-x+x^2$
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