$12x-12$
$sin\:4x\:cos\:x-sin\:x\:cos\:4x\:=\:\frac{\sqrt{2}}{2}$
$4x^2y+2x-6x^2y-9x$
$3\cos\left(x\right)=2$
$\int\left(x^4-3\right)^2dx$
$\lim_{x\to6}\left(\frac{x-6}{\frac{1}{6}-\frac{1}{x}}\right)$
$\left(\frac{1}{3}xy-z\right)\left(\frac{1}{3}xy+z\right)$
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