$x^2-6x+11$
$x^2+54x+72$
$6 ( 7 - 3 y ) + 6 ( y + 1 )$
$3\csc\left(x\right)\tan\left(x\right)+3\sec\left(x\right)$
$\left(3y\right)\left(-7y\right)$
$2a+b+a-3b$
$\sqrt[2]{16\:x\:25}$
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