$-1+5-3+12-7-6-8-9+2+6$
$-9\cos\left(\frac{17}{5}\pi\right)+7$
$\lim_{x\to-2}\sqrt{\frac{x+2}{\left(x-2\right)^2}}$
$9x^2-21x+10$
$3x+2\cdot3x-1$
$\left(6a^5b^3-5c^7\right)^2$
$\sqrt{x}\cdot\sqrt[4]{x}$
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