$x^3<0$

$\frac{dy}{dx}=4-\frac{y}{100+x}$

$3\left(x-5\right)-4\left(4-3x\right)\geq2\left(7-x\right)-3\left(x-5\right)$

$2\int_0^{\frac{\pi}{2}}\left(sen2x\right)^2dx$

$\lim_{x\to3}\left(\frac{x^2-19x+48}{x-3}\right)$

$2\frac{dy}{dx}=x$

$\lim_{x\to-4}\left(\frac{\sqrt{5}-\sqrt{x+9}}{x+4}\right)$