$\frac{x-4}{3}+\frac{2x-3}{9}\ge0$

$2xy+10x+\left(x^2-4\right)\left(\frac{dy}{dx}\right)=0$

$a+1\:x\:a+2$

$\frac{d}{dx}\left(4-3e^x-e^{-3x\:}\right)$

$\frac{\sin^4\left(x\right)-\cos^4\left(x\right)}{\sin\left(x\right)-\cos\left(x\right)}$

$sin^{-1}\left(0.23\right)$

$\frac{d}{dx}\:\:y^2=4x^2+9$