$\left(x^2-1\right)\left(x^2+x\right)$
$\log\left(2x+3\right)=\log\left(x-3\right)$
$-5\left(5+-9\right)$
$ln\left(x+31\right)-ln\left(4-3x\right)=ln32$
$\int\:\frac{x^2+2x-3}{x^2}dx$
$-\infty-89$
$\lim\:\:x\to\infty\left(\frac{\sqrt{1+x}-\sqrt{1-x}}{x}\right)$
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