$49-a^2$
$\int\frac{2x^7+x^2+4}{\left(x^2+4\right)^2}dx$
$\frac{18}{m+1}=2$
$\frac{2}{2x+1}\:-\:\frac{3}{2x+1}$
$\left(10x^3-5y\right)^2$
$3,025+0,21$
$\lim_{x\to\pi}\left(\left(\pi-x\right)\tan\left(\frac{x}{2}\right)\right)$
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