$\frac{12a}{a}$
$\tan^23x-\sec^23x$
$csc\:x\:+\:5\:=\:8$
$b^2-6b+8$
$\left(-x+\frac{1}{2}y\right)^2$
$\left(x^2-8x+16\right)+1$
$\left(\frac{5x^4}{4}-\frac{7x^2}{2}\right)$
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