$sinxcosx=sinxcosx-cosx$
$\lim_{x\to\infty}\left(\frac{x\left(2x-1\right)^2}{\left(x+2\right)\left(x-2\right)\left(x+1\right)}\right)$
$\frac{-228}{-12}$
$6\left(13\right)$
$\sqrt{-18\:}\left(\sqrt{-7}-\sqrt{5}\right)$
$\lim_{x\to\infty}\left(\frac{\sqrt{1+x^2}-x}{\sqrt{x+1}-\sqrt{x}}\right)$
$x + 3 = \sqrt { 3 x - 1 }$
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