July 2023 1 42 Report
[Trigonometria: Identidades trigonométricas – tangente e secante]

Mostre que

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

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