$\frac{dy}{dx}=\frac{2xy}{x^2+4}$
$\left(\frac{1}{2}x^{n+1}+\frac{2}{7}\right)\left(\frac{1}{2}x^{n+1}-\frac{2}{7}\right)$
$-ab^2;8\:y\:b=-4$
$45.5\cdot3.14$
$9b^2-16x^4$
$x\sqrt{x}^2+2$
$\left(2x^2-x\right)^22\left(x+1\right)$
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