$\frac{x^2-3x-3}{x^2-2x+1}$
$\left(8-2i\right)\left(8-2i\right)$
$15-1.600$
$3\cdot1-3$
$x+3\ge5$
$\frac{2cot^2x-csc^2x}{1+cot^2x}$
$\lim_{x\to-4}\left(x-1\right)$
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