$\left(x+\frac{1}{x}\right)^2=6$
$-\ln\left(x+1\right)+0.5\ln\left(1+x^2\right)$
$2\cos^28x-1$
$\left(y^2+2xy\right)dx+\left(x^2+2xy\right)dy=0$
$\frac{2x-6}{x-4}+2x-5$
$16.13-87.23$
$-4xe3ye2z$
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