$1.11+1$
$x^2+x+2\ge0$
$xy+y=6$
$\frac{-3}{x^2-x}+\frac{3}{x-1}=0$
$\int_0^ncos\left(\frac{x}{2}\right)dx$
$\int\ln\left(3x-5\right)dx$
$\frac{sec\left(u\right)}{\sec\left(u\right)-1}=\frac{1}{1-cos\left(u\right)}$
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