$2xydx+x^2-1dy=0$
$\left(9-b+c\right)^2$
$x^2+14x+49=0$
$3-5\cdot\left(2+6\cdot4\right)$
$-7x^2+12x+36$
$\frac{1+\cos\left(2x\right)}{\cos\:\left(2x\right)}$
$\left(5y^5+2x\right)^3$
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