$95+49-\left(-91\right)-95$
$\left(13a+11b\right)\left(13a-11b\right)$
$6x^2-12x-5$
$x^2+25x+72$
$\int\:\:in\left(1+z^2\right)dz$
$\left(x^4-x+y\right)dx+\left(x\right)dy=0$
$\frac{4}{\left(x^3+8x+4\right)^{\frac{1}{2}}}$
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