$\lim_{x\to\infty}\left(\frac{sen\:}{x^3+2x^2-x+1}\right)$
$1-\tan^2b=2-\sec^2b$
$4x^3-1,5x^3$
$4-\left(-2\right)+1\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:$
$\sqrt[4]{x}=1$
$3x^2-8x+4$
$9y^2-18y-9$
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