$\left[\sqrt{1+\sqrt{1\sqrt{1}}}\right]4$
$\frac{1}{16}\int\frac{cos^2x}{sen^2x}dx$
$\frac{1}{\cos\left(2x\right)}$
$\frac{\cos\left(2x\right)}{2}$
$9x^2-7x\le5+3x+9x^2$
$3-5x>10-7x$
$\lim_{x\to\infty}\left(\frac{x^2+1}{x^2}\right)^2$
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