$xy'+y=5x^3$
$\lim_{x\to-5}\left(\frac{x^3+5x^2}{x^2+10x+25}\right)$
$dy=\left(2x\right)\left(y\right)dx$
$\tan^4x+\tan^2x+1$
$23=b+14$
$x^2+10x-96$
$16^2+12a$
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