$\frac{-2x^4}{-5+x^2}$
$\lim_{x\to1}\left(\frac{3x^2+5x-3}{3x+2}\right)$
$\left(x-0.4\right)\left(x-12\right)$
$x^2-64x+64$
$2x-46+20x-7$
$7y\cdot7y\cdot7y$
$1-2\sin^2\left(17\right)$
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