$\left(6ab-7xy\right)^2$
$2x+2+26$
$\cos\left(\pi-a\right)\cot\left(\frac{\pi}{2}-a\right)$
$0^4-5\cdot0^2+7\cdot0-20$
$\left(a+11\right)\left(a+4\right)$
$9x-6\le3$
$\int\left(7+x^8\right)^3x^7dx$
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