$\lim_{x\to\infty}\left(\frac{7}{2x+1}\right)$
$\left(1-2senx\:sen^2\:x\right)\left(1-2sen+sen^2x\:\right)\:cos^4x$
$\:\:5x\:^2\:para\:x\::\:1$
$12x+9\ge-3x^2$
$-10\::\:0$
$-7+4.5$
$-7-\left(-12\right)-3$
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