$20+12+15-11+4$
$5.7-+88$
$x^2-3x=2$
$\left(\frac{1}{4}x^3-\frac{2}{3}x^2-\frac{5}{2}x^2\right)^2$
$6xy+12xz-5yz-10z^2$
$\left(x^2-2x-15\right)^2$
$\sin\:\left(360^{\circ\:\:}-\theta\:\right)=-sin\theta\:$
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