$\left(3w^2-19\right)\left(3w^2-19\right)$
$2\sin x+3\cos x=y$
$2x+9^2$
$\frac{\left(\sec^2\:\right)}{sec^2-1}=\csc^2$
$xy+4y=x^{-3}e^x$
$m^2+7mn-4m^2-6mn+3mn^2$
$\left(4ab+2c\right)^{2}$
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