$\cot\left(t\right)=1$
$z=2x+3y$
$\frac{1-1}{\sqrt{3.1}-2-1}$
$600.00-562.75$
$\left(1-\sqrt{x}+x\right)^2$
$6x^2-117x+660$
$1^{-7}$
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