$m^2n-4m^2+3mn-\left(m^2n+3mn^2-2m^2\right)$
$\frac{1-\cos^{2}\beta}{\cos^{2}\beta}$
$5x-4+3x+2-16-18x+3-4x$
$\lim_{x\to0}\left(\frac{7^x-\sqrt{x+1}}{2^{3x}-1}\right)$
$f\left(x\right)=\:2x^2-\frac{3x}{5}$
$3\left(x+2\right)>x+10$
$\frac{x^3-46x+22}{x+7}$
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