$\left(x^2y+4z\right)^3$
$4\left(2z\right).$
$x^7dx+y^7dy=0$
$\lim_{x\to\infty}\left(1+\frac{4}{x}\right)^{\frac{x}{4}}$
$\left(-7\right)\left(-4\right)\:-\:8\::\:\left(-2\right)\:-\:4\:-\:6\::\:2$
$\frac{dy}{dx}\left(y-x\right)=y-x+8$
$x^2+20x+91$
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