$\frac{d^2}{dx^2}\left(\frac{c}{x^n}\right)$

$sec\left(-x\right)-sin\left(-x\right)tan\left(-x\right)=cos\:x$

$\frac{\sqrt{3}+\sqrt{2}}{\sqrt{2}}e^{1}$

$2sin^2\:x\:-\:3\:sin\:x\:+1\:=\:0\:$

$4\left(x+10\right)-2\left(x+22\right)$

$\left(a^{n-1}+b^{nm-1}\right)\left(a^{n-1}-b^{nm-1}\right)$

$\left(4x^3+5x^2-9x+6\right)\left(5x+2\right)$