$\left(mna+1\right)\left(mna-1\right)$

$9y^{\left(2\right)}+36>0$

$\left(2b-4a\right)\left(a+b+c\right)$

$\left|24\right|-\left|-17\right|$

$\lim_{x\to\infty}\left(\frac{x^2-3}{x^2+x}\right)^{2x+1}$

$4\cot\left(b\right)=\cot\left(b\right)\sin^2\left(b\right)$