$2 + x y = 1$
$\left(2m-5n^3\right)^2$
$\frac{sinx\left(2cos^2x-1\right)}{cosx}=tanxcos2x$
$-9\:y-18$
$16a^2b^2-49c^4$
$2^4+18$
$\left(2-2t^5\right)^3$
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