$\lim_{x\to\infty}\left(\frac{sin\left(\frac{3}{x}\right)}{sin\left(\frac{6}{x}\right)}\right)$
$\int\left(t\left(2-3t^2\right)^2\right)dt$
$3x^2+20x-7$
$4\left(-2y^2-3y+2\right)$
$k^3+8$
$\left(-3a^2+2\right).\left(a^2+4\right)$
$\left(8-5\right)\left(6+9\right)$
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