$\left(2w^4-8r^4\right)^2$
$\left(-5x^2\right)\left(4x^2\right)$
$2x+3x-4xy$
$-9\csc\left(x\right)-18=0$
$-222+-49$
$z^4-64w^2$
$9\left(a+2d\right)^4-60\left(a+2d\right)^2+100$
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