$5x^2+40x+15$
$\left(-8m^3+5n^2\right)\left(5n^2+8m^3\right)$
$xy-4y=0$
$\lim_{x\to0}\left(\frac{1}{x}-\frac{1}{sinhx}\right)$
$\tan^{-1}\left(\frac{7}{14}\right)$
$23-x=4$
$\lim_{x\to1}\left(\frac{\sqrt{2x-1}-1}{x^2-3x+2}\right)$
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