$2c+4a-3b\left(5a-2c\right)$

$\tan\left(-\frac{9}{4}\pi\right)$

$y=ae^{5x}+be^{-2x}-\frac{1}{2}e^x$

$\lim_{x\to-\infty}\left(\frac{4+x-2x^3}{2x^2-3x+11}\right)$

$\frac{\left(\left(-3\right)^4\:x\:\left(-3\right)^3\:x\:\left(-3\right)\right)^2\:\:\:\:\:}{\left(\left(-3\right)\:x\:\left(-3\right)^5\:x\:\left(-3\right)^0\right)^1}\:$

$\frac{d^2}{dx^2}\left(x^5\:+\:x^4\right)$

$\int-24x^{-7}dx$