$t=2\:\:\:x^2+y^2\:$
$\left(a+b\right)^2\:-\:\left(a+b\right)\left(a-b\right)$
$5-\left(-6\right).\left(-7\right)$
$t^2+t-2$
$\left(m^2n-n^3\right)\left(m^2n+n^3\right)$
$\int\frac{8x-1}{\left(x-1\right)\left(x+3\right)}dx$
$956.4\cdot3.8$
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