$\int\frac{4x-7}{x^2-3x+2}dx$

$1+tan\:x-\frac{\cos\left(x\right)}{1+\sin\left(x\right)}=\tan\left(x\right)$

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

$\frac{dy}{dx}+2y=1+e^{-x}$

$\left(-77\right).\left(-11\right)$

$-x^3+6x^2-12x+8$

$\left(a\:+\:4\right)\:\left(a\:-\:2\right)\:$