$x^3+4x^4+x-6\left(x+2\right)\left(x+3\right)$
$2x\:-\:7x\:-\:9x\:$
$\frac{2tdq}{dt}+\frac{q}{lnt}=0$
$cos\left(x^2\right)sec\:\left(x\right)^2$
$\left(a\:-\:2b\right)^2$
$25x^2-20xz+4z^2$
$x\left(a+b\right)-a-b$
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