$\left(arctan\left(y\right)\right)=\left(arctan\left(x\right)\right)$
$x^2+\:2x+1>0$
$cos\left(x\right)=cos\left(-x\right)$
$\left(11^3\right)^3$
$x-10\le20$
$\int2\sqrt{x^2+3}dx$
$\left(3x-2\right)\cdot\left(3x+2\right)=77$
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