$\cos\left(3x\right)=1$
$\lim_{t\to1}\left(\frac{ln\left(t^2\right)}{t^2-1}\right)$
$-x^4-2x^3+5x^3$
$\int\frac{x+4}{4x^2-2x-3}dx$
$\frac{b^2-9b-x}{b^2}$
$11b^2-2b-2b^2-18-2b+14$
$3-4x<\frac{5}{3}$
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