$\cos^2x\:-\:\sin^2x$

$3p^4\left(p^8\right)\left(-p^3\right)$

$\frac{d}{dx}\left(\sqrt{y}=e^{x-y}\right)$

$2\left(x-1\right)\left(x-3\right)>0$

$\left(57.31\right)\left(7.86\right)$

$\frac{d}{dx}\left(\sinh\left(\cosh\left(x\right)\right)\right)$