$79a^6b^4+88ab^4$
$x^2+4\left(x+4\right)$
$-36\cdot9$
$121x^2y^6\:\::\:11yx^4$
$\left(5r\right)^4$
$\frac{\cos^2\left(x\right)}{\sin\left(x\right)-\csc\left(x\right)}$
$9y^3y^3+12y^3$
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