$3x^2y\:6y^2x$
$\cot^2\left(a\right)\cos^2\left(a\right)=\cot^2\left(a\right)-\cos^2\left(a\right)$
$2600\cdot4$
$1+18x+81x^2$
$4x^2-9x^2$
$4+8>16$
$\left(1\:-\:8xyu^2\right)^3$
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