$\lim_{x\to0}\left(\frac{1-cos\left(t\right)}{sin\left(t\right)}\right)$

$\frac{x-1}{x+4}+\frac{4x-2}{x+1}$

$50+50+50+30+47$

$\lim_{x\to0}\left(\frac{ln\left(x+1\right)-a\cdot sen\left(x\right)+sen\left(3x\right)}{x^2}\right)$

$-3\left(2x^6y^{-4}\right)^{-2}$

$\frac{dy}{dx}=xy-2y-2$

$64m^9-216$