$\frac{cot\:\left(\theta\:\right)\:-\:tan\left(\theta\:\right)}{Sen\left(\theta\:\right)\:+\:cos\left(\theta\:\right)}$

$\frac{dy}{dx}=\frac{2\:sin\:y}{x\:cos\:y}$

$\left(x^2+xy+y^2\right)\left(a-b\right)$

$\frac{d}{dx}\left(\sin\left(5x\right)+\cos\left(5x\right)\right)$

$-x^2-2x-10$

$\frac{1-sen^2x}{sec^2x}\:$

$\left(-2x-3\right)\left(2x+3\right)\ge0$