$2xy^2dx+\left(1+2x^2y\right)dy=0$
$8x-2x+4x$
$\left(3a^6-4\right)^2$
$34x^2+4^2$
$2m^2-m+4$
$3x^2+x^+1$
$\lim_{x\to\frac{\pi}{2}}\left(\frac{\pi}{2}-y\right)tany$
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