$\lim_{x\to0}\left(\frac{\sqrt{2}x+1-\sqrt{3}}{x-1}\right)$

$8y-\left(-8y\right)$

$-3\:\left(2+5\:-8\right)$

$-x^2\:+\:23x=0$

$\int\frac{tan^4\left(x\right)}{\sec^5\left(x\right)}dx$

$x=ln\left(x-y\right)$

$\cos\left(\frac{3}{5}\right)\cos\left(\frac{-3}{5}\right)+\sin\left(\frac{3}{5}\right)\sin\left(\frac{-3}{5}\right)$