$-x^2-2x+3\ge0$
$\frac{52.5}{2}$
$a^2,3a^2,8a$
$\int\:\frac{3x^4-2x^3+x^2-10}{x^2+2}dx$
$\sec^230^{\circ}\:+cos^260^{\circ}\:-1$
$b^2-5b$
$\frac{\left(-69\right)}{\left(-3\right)}$
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