Recent Content by milo_cuncon

$ \widehat{\alpha}=\widehat{A_1OH} - \widehat{AOH} =\pi/2-\pi/3=\pi/6 $ ; $ \widehat{\beta}=\pi -\left(\pi/2 - \varphi_2\right) $. Định lí sin cho $ \Delta A_1OA $ : $ \dfrac{A_1A}{\sin \left(\alpha\right)} = \dfrac{OA}{\sin \left(\beta\right)}\Leftrightarrow \dfrac{A_2}{\sin...

$ A_1 ^2 = A_1^2 + A_2^2 +2A_1A_2\cos \varphi2 $ <=> $ A_1 = -2A_2\cos \varphi2 $ $ \tan \varphi ={\dfrac{A_2\sin \varphi2}{A_1 + A_2\cos \varphi2}} = -{\dfrac{A_2\sin \varphi2}{A_2\cos \varphi2}} = -\tan \varphi2 = -\tan \left(\varphi + \pi /6 \right) $ -> $ \varphi = -\pi/12 $, $ \varphi2 =...