$-2\cdot1-2$
$64+0\cdot125y^9$
$\frac{5x^{7}y^{2}}{5xy^{2}}$
$2x^4-4x^2-6x-4$
$\frac{1}{\cos\left(a\right)}=\frac{1}{2t^2-1}$
$g-6g$
$1\left|\left(1+x^2\right)-1\right|$
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