$\lim_{x\to0}\left(\frac{\tan\left(x\right)-\cos\left(x\right)}{x^3}\right)$

$\left(y^3\right)^6$

$x^4+0+9x^2+4x+12$

$-3x-2y=-2$

$\left(e^{2x}+4\right)\frac{dy}{dx}=y$

$sen\frac{\pi}{3}cos\frac{5\pi}{6}+cos\frac{\pi}{3}sen\frac{5\pi}{6}$