$\left(2x+3y\right)dx+ydy=0$
$y^2=576$
$2eso:2a$
$x^2+y^2+z^2-6z=16$
$\int cos\left(\frac{1}{2}\right)dx$
$3a^2+78a+507$
$\lim_{x\to-2}\left(\frac{x-4}{2-\sqrt{8-x}}\right)$
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