$20^2+18$
$x^2-1x+121$
$6x^2-7y^2=93$
$\left(2^2\right)^1$
$\frac{\cos\left(x\right)\csc\left(x\right)}{\cot^2x}$
$\left(5+x+\cos\left(\frac{\pi}{8}\right)\right)^2$
$35:-5$
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