$\cos^2\left(2x\right)-4=0$
$\lim_{x\to0}\left(\frac{sen\left(ax\right)}{sen\left(bx\right)}\right)$
$-2x\:\:+\:\frac{4}{5}\:<\:0.5x\:-\:2.2$
$\frac{2x+1}{x\left(x+1\right)\left(x^2+4x+6\right)}$
$\:\:\:\:\:-45x\:-9$
$\frac{x-1}{x-2}\ge2$
$\lim_{n\to\infty}\:1+0^n$
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