$\left(10x^2-11y^2\right)\left(10x^2+11y^2\right)$
$2x+1^2$
$7x-8y;\:x=5;\:y=2$
$-85+1-6$
$x^{-2}e^{-2x}$
$c^9m^4\cdot c^3m^8$
$\lim_{x\to0}\left(\frac{12x^2+8x}{-2x}\right)$
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