$\left(n^{-2}\right)^{-1}$
$-2\sqrt{4}$
$\left(\left(x-3y\right)\left(x+3y\right)\right)^2$
$\left(2^{-1}a^3b^{-2}\right)^{-4}\left(3a^{-5}b^5\right)$
$5x^3\cdot\:2x^4$
$tan^2\left(x\right)\:csc^{2\:}\left(x\right)\:=\:\frac{1}{cot^2\left(x\right)}-1$
$x^3-x^5-x$
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