$\left(x+y-3\right)dx+\left(x+y+4\right)dy=0$
$x^2+21x+3$
$9n^2+6n+1$
$\frac{d}{dx}5\cos\left(6x^2-6\right)^3$
$430\cdot15$
$+4\:-\:\left(-6\right)$
$-6\left(-4\right)\left(-2\right)\left(1\right)$
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