Question

Se considera triunghiul ABC, dreptunghic in C. Arătați ca tg B=1 / tg A

Answer 1

Răspuns:

   

    $tg~B=\dfrac{AC}{BC}\\\\\\tg~A=\dfrac{BC}{AC}\\\\\\\dfrac{AC}{BC}=\dfrac{1}{\dfrac{BC}{AC}}\\\\\\\\\dfrac{AC}{BC}=1:\dfrac{BC}{AC}\\\\\\\dfrac{AC}{BC}=1*\dfrac{AC}{BC}~~(\text{A})$