$\lim_{x\to0}\left(\frac{x+2sen\left(x\right)}{x-2sen\left(x\right)}\right)$

$\left(\sin\left(x\right)\right)^2-3\left(\cos\left(x\right)\right)^2=4\left(\sin\left(x\right)\right)^2-3$

$5ab;\:a=1b=-3$

$\frac{d}{dx}x^2+y^2=z^2$

$\left(x-y\right)\cdot\left(z^2\right)$

$2344\cdot35$

$2\:sin^2\:\theta-\:2\:=\:$