$-4-\left(4-3\:4\right)-\left(-9-18-3\right)$
$27z^3-125f^3$
$\int\:\:sec^6\:acos2\:ad\:a$
$sin\:\left(x\:-\:y\right)$
$16x^2y^2-44x^3y^3+18x^2y^2$
$x^2-8=-7x$
$\lim_{x\to\infty}\left(\frac{\left(5x+9\right)}{6x^2+7x-8}\right)$
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