$\tan\left(x\right)\cdot\sec\left(x\right)\tan\left(x\right)$
$\frac{x^4+x^2-3}{x^3}$
$\lim_{x\to0}\left(x^2\sin\left(\frac{5}{x}\right)\right)$
$\int\frac{x+3}{x^4-9x^2}dx$
$-c+c-c+4c$
$x^2+7x=0$
$20\log\left(20.7\right)$
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