$\frac{x+1}{x}\cdot\frac{x-1}{x}$

$\frac{dy}{dx}+\frac{y}{3}=\frac{1}{3}\left(1-2x\right)y^4$

$\lim_{x\to0}\left(\frac{\left(2\cdot n+1\right)sin\left(x\right)-sin\left(\left(2\cdot n+1\right)x\right)}{4sin^3\left(x\right)}\right)$

$2\log x+\log y=\log3$

$20x^2-33x+7=0$

$\int cot^22xcsc^22xdx$

$-10m+25m^2+m^2$