$x^2-2-1$
$-11+14-15-9+10-8-11-3$
$21+4\left(1+2\cdot\left(6-10\right)\right)$
$\left(4x^4-6x^3+4x^2-8x+6\right)\left(5x^3+9x^2+6x-17\right)$
$\sqrt[4]{x^6}$
$\frac { 3 } { 3 } i ^ { 2 }$
$\frac{4}{\left(x-3\right)\left(x+1\ \right)}$
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