$\left(x+2\right)^{2}-3x\left(x+1\right)+\left(x-1\right)\left(x+1\right)$
$-7b-1b$
$\frac{6x-12y}{18-36y}$
$\lim_{x\to1}\frac{1-x^2}{\ln\left(x\right)}$
$\frac{-4x^2+239}{x-5\cdot\left(13+\sqrt{4x^2+69}\right)}$
$25cos^2o-9=0$
$2\sec^2\left(0\right)\tan\left(0\right)$
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