July 2023 1 52 Report
[Trigonometria: Identidades trigonométricas]

Mostre que

     [tex]\dfrac{2\sec(2x)}{\sec(2x)+1}=\sec^2(x)[/tex]

para todo [tex]x\in\mathbb{R}\setminus \left\{\dfrac{n\pi}{4}:~~n=2k+1~~\mathrm{ou}~~n=4k+2,~~k\in\mathbb{Z}\right\}.[/tex]​
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