$6x-8x^3$
$\lim_{x\to\pi}\left(\frac{\left(senx+cosx+1\right)^2}{x-\pi}\right)$
$16x^4-\frac{16}{81}y^2$
$3x+1-4x-10$
$\sqrt{200.5^2-199.5^2}$
$\left(a^4-1\right)\left(x^2+8\right)$
$\lim_{n\to0}\left(\frac{n}{n+3}\right)$
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