$10m^3n^2+mn$
$7-2\tan\left(4x\right)=13$
$\lim_{x\to0}\left(\frac{2^{2n-50}}{5^n}\right)$
$\csc^2\left(x\right)=\frac{1-\cos\left(x\right)^2}{1-2\cos\left(x\right)^2+\cos\left(x\right)^4}$
$cos^2x=sinx\left(cscx+sinx\right)$
$\frac{3x-6+ax-2a}{x-2}$
$-x-5>-2x-6$
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