$\lim_{n\to\infty}\left(\sqrt{n^4+2n^3}-\left(n^2+n\right)\right)$
$\left(m-12\right)\left(m+1\right)$
$a-\sqrt{a^2}$
$\tan\left(x\right)\cot\left(x\right)-\cos\left(x\right)=\sin^2\left(x\right)$
$1\cdot65$
$16g+10-4g$
$541+68$
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