$\csc\left(x\right)+4=0$
$\lim_{x\to\infty}\left(-\frac{x}{e^{x^2}}\right)$
$2log\left(10x\right)+log\left(4\right)=4log\left(x\right)$
$\frac{\left(tan^2x-sec^2x\right)}{cosx}$
$\left(3a^5+7b^2\right)\left(9a^{10}-21a^5b^2+49b^4\right)$
$6mc-4c^2$
$x^2+8x+4$
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