$3y^3dx=6x^2dy$
$81a^2-36a^2$
$-17=p-18$
$4x^4+4x^2y^3+y^6$
$\sec\left(x-90\right)\:=\:csc\:x$
$\left(7xz^2-4xy^2\right)^2$
$\frac{1+x^{24}}{1-x^8}$
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