$\left(9xy+8z\right)\left(9xy-8z\right)$
$\left(a^{-4}b^{-1}c\right)^{-2}\left(a^2bc\right)^2$
$\lim_{x\to0}\left(\frac{\sin\left(2x\right)\cdot\cos\left(x\right)}{\sin\left(x\right)}\right)$
$x-1>-3$
$\left(3x^2y+2y^2x\right)^3$
$3x^2-x^2+6x-2$
$\:\cos\left(3\right)^2\:x\:+\:\sin\left(x\right)^2=3$
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