$x^2-5x-3x^2+8$
$a2-4$
$y\:=\:sin\:t\:cost$
$-14x\cdot2$
$\left(3x^4+y^5\right)^2\left(3x\:4\:+y\:5\:\right)^2$
$3+4\cdot6-2$
$\frac{u^2+1}{u+1}$
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