$\frac{dy}{dx}=-\frac{y}{x\left(-1+ln\left(\frac{x}{y}\right)\right)}$

$\frac{d}{dx}\left(-2sin^4x\right)$

$\int\left(\frac{11\ln\left(x\right)}{x\sqrt{3+\left(\ln\left(x\right)\right)^2}}\right)dx$

$\lim_{x\to-\infty}\left(9x^4-9x^2\right)$

$4-2x>10-5x$

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

$\sin^2a+2\cos2a=2\cos a$