$-x^4+x^2-2x^2+1$
$z^4-64w^2$
$\left(+4\right)-op\left(6\right)$
$\int\left(6+2x\right)^2dx$
$\left(-1.2\cdot3\right)+\left(-10.5+13.1\right)\cdot2$
$\left(\frac{5}{2}x-3y\right)^2$
$\frac{c^2-d^2}{c+d}$
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