$\int axdx$
$\lim_{x\to\frac{x}{2}}\left(\frac{sinx-cosx-1}{cosx}\right)$
$6b\cdot6b$
$\left(3a^2-2b\right)-\left(a^2+b\right)$
$3xy+z\:\:\:x=2$
$3x^4+x^2-2x+1=y$
$1-2+3+4+5-6+7-8$
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