$\frac{11}{18}m^2-\frac{7}{6}m^2$

$\lim_{x\to-\infty}\frac{x^3}{e^{x^2}}$

$-4x+14<54$

$15a^2-6ab-8a^2+20-5ab-31+a-b$

$-\left(57-62\right)-\left(-70\right)-\left(-18\right)+11$

$\lim_{x\to\infty}\left(\frac{2x^2-9}{x\left(x^2+1\right)}\right)$

$2\cos^2\left(-60\right)-1$