$\frac{\sin\:^4x-\cos\:^4x}{1-\cot\:^4x}$
$\left(6x-7y\right)\left(36x^2+42xy+49y^2\right)$
$\left(p-4r+q\right)^2$
$\left(4-2\sqrt{5}z\right)$
$5671\cdot209$
$x^2-22-121$
$f\left(x\right)=x^2+3x$
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