$x^2.4=0$

$25-8.457$

$-\:y\:-\:5y\:-\:8y\:+\:5y$

$\frac{dy}{dx}\left(\frac{\cos\left(x\right)}{x^2+1}\right)$

$\frac{d^2}{dx^2}\left(-sin\left(3\cdot x\right)\right)$

$\lim_{x\to0}\left(\frac{4\left|sin\left(x\right)\right|}{\left|x-4\right|+\left|x+4\right|}\right)$

$\lim_{x\to-3}\left(\frac{1-\cos\left(x\right)}{x^2}\right)$