$\left(\sqrt[3]{2+6}\right)\left(\sqrt[3]{2-1}\right)$

$\frac{\sin\left(2x\right)}{1+cos2x}=tanx$

$23x^3-5x^2$

$\frac{1}{1+tan\left(x\right)}-\frac{1}{1+cot\left(x\right)}=1$

$\frac{dy}{dx}=\frac{e^{-y}\left(1+e^{-2x}\right)}{e^xy}$

$a^5bc3+\frac{3}{4}a^6bc3$

$\int_{\pi}^{2\pi}cos2xdx$