$\left(7m+4\right)\left(7m-4\right)$
$3x^2+24x+47$
$\frac{\cos\left(x\right)}{\frac{1}{\cos\left(x\right)}}$
$\left(x+y^{\left(2\right)}-5\right)\left(x-y^{\left(2\right)}+5\right)$
$\left(\sin\left(x\right)+\cos\left(x\right)\right)^2+3$
$25m^2-20m+4$
$\frac{dz}{dr}x^2-xr^2-1=0$
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