$\left(2x^{a+4}8y^{a-1}\right)^3$
$3^2+36$
$6-8a+7-12a$
$xy^2-y^2w$
$cos3x+cosx$
$y^2+22+121$
$1-\left(6+4-20+\left(3-7\right)+2\right)$
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