$42\cdot10$
$n^2+2nu+u^2$
$\left|10+\left(-2\right)\right|\cdot\left(2-\left|\left(-8\right)+16\right|\right)$
$\lim_{x\to-3}\left(\frac{x^3-6x^2+9x}{x^3+5x^2+3x-9}\right)$
$\frac{8}{27}a^6+\frac{1}{64}b^3$
$\cos^2x+2\sin x+2$
$450-\left(-50\right)$
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