$2xy\:dx+\left(x^2-1\right)dy=0$
$a^2+b^2+c^2-2abc$
$\lim_{x\to1}\left(\frac{e^{2.\left(x-1\right)}-1}{\sqrt{4x^2-5x+1}}\right)$
$-18=6y-6$
$2-4u+8u$
$\tan^2a-\sin^2a$
$\frac{1}{3}x+14=26$
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