$8x^2-8xy+2y^2$

$\lim_{x\to1}\left(\frac{ln\left(ex\right)-1}{sin\left(\pi x\right)}\right)$

$6x+\left(14x-5\right)+\left(17-3x\right)$

$\int\frac{x^2}{\left(x-1\right)\left(x+1\right)}dx$

$\frac{1-\cos a}{1+\cos a}=\left(\csc a-\cot a\right)^2$

$11x-3+-9x-y-7$

$-6\left(q\:+\:7\right)$