$\frac{2x^2-5x+2}{2x-1}$
$-6\:+\:2\:.\:-6\:+\:5\::\:-\:1\:$
$\int\:\frac{4x-1}{x^3+2x^2}dx$
$\lim_{x,y\to0,0}\left(x^2+y^2\right)ln\left(x^2+y^2\right)$
$-2x\left(x+1\right)=-6$
$\frac{\sec\left(a\right)^2}{1+cot^2a}=\tan\left(a\right)^2$
$-45-\left(-31\right)$
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