$64a^2+160ab+100b^2$
$\frac{11^9}{11^2}$
$2x^2y^2+x^2+y^2-5,\:x=0,\:y=0$
$\int\:\frac{cotx}{\sin^2t}dt$
$\frac{-4x^5+x^3+2x^2-3+1}{x+1}$
$\frac{x}{x^{-3}}$
$\left(1+\cos\left(2x\right)\right)^2\left(1-\cos\left(2x\right)\right)$
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