$\lim_{x\to\infty}\left(\frac{1}{\sqrt{x+1}-\sqrt{x}}\right)$
$\left(x^2+10\right)^5\cdot\left(3x\right)$
$43\:x\:\left(-100\right)$
$x-2\left(x^4+x^3-6x^2-4x+8\right)$
$5x^2-45=0$
$cos\left(25\right)cos\left(70\right)sen\left(25\right)sen\left(75\right)$
$\left(y\:-\:9\right)^2$
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