$4\cdot\cos\left(75\right)^2$
$\lim_{x\to\infty}\frac{4x^2-10x+6}{4x^2-10x+6}$
$\cos\left(x\right)-\cos\left(2x\right)$
$44n^2b-22nb^2$
$\lim_{x\to a}\left(x^3-x\right)$
$\frac{\left(\frac{senx}{cosx}+\frac{cosx}{cotx}\right)}{cotx}$
$72m^2-17m-72$
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