$x^2-6x+6=9$
$x9\:\cdot\:x-7$
$\left(-10\right)^2+\left(-10\right)^3$
$4y^2-8y^4+6y^4$
$5x^5-5x^4$
$8^1\cdot8^2$
$\frac{\cot\left(\frac{\pi}{2}-x\right)}{\cos\left(x\right)}$
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