$x=37\tan\left(62\right)$
$x^4-ax^2$
$\frac{3x\:-\:13}{2x^2\:-\:2\:+\:8\:\:}$
$8\left(5m\:+5n-1\right)$
$f''\left(x\right)=5x^2-15x-\frac{7}{x^2}$
$\lim_{x\to0}\left(\frac{sin5x+xcos2x}{x^2+x}\right)$
$\lim_{x\to-a}\left(x-a\right)ln\left(a-x\right)$
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