$x\:x\:\sqrt{x^2+1}+x$
$1520-1945$
$\left(12w\:\:+\:\:z\right)^2$
$2x+3y-\left(4+2\left(3-x\right)-2x+y\right)$
$\left(\frac{6x^{-2}y^3}{\left(18x^7y^{-4}z\right)^{-2}}\right)^{-1}$
$\left(6h^5+10t^8\right)^2$
$456.3+90+3.87$
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