$\frac{\sqrt{1+\sqrt{x}}}{\sqrt{x}}$
$dx-\left(1+2\tan y\right)dy=0$
$\left(\sqrt{t}-4\right)\left(\sqrt{t}+4\right)$
$u=\ln\left(x\right),v'=1$
$-9\left(-4r+6s\right)+3s-7\left(6s-2r\right)$
$5y<2$
$\lim_{x\to\infty}\left(\frac{3x^4-4x+6}{x^2+5x-8}\right)$
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