$\frac{1}{2}a^3b-2a^2b^2+\frac{1}{3}ab^3+4;\:a=2;\:b=-1$
$2\cos^2x-3\cos x+1=0$
$\frac{1}{2}x+\frac{3}{2}x$
$x^2y+y-x=1$
$\left(m^2-y^2\right)^2$
$u^2-6u+u$
$4n^2\:-\:24n\:+\:36$
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