$\left(x+1\right)^2=x^2+2x+1$
$\frac{x-1}{\sqrt{x}}$
$\int2\left(x+1\right)dx$
$4x^2-14x+49$
$\left(5x-2\right)\left(-x^2\right)$
$-2+-2.135$
$18+\left(7\right)-\left(-6\right)\cdot\left(-4\right)$
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