\[ \cos^2(\phi) = \frac12 \quad \Rightarrow \quad \cos(\phi) = \pm \frac1\sqrt2 \] - AMAZONAWS 📅 March 6, 2026 👤 scraface Mar 06, 2026
![\[ \cos^2(\phi) = \frac{1}{2} \quad \Rightarrow \quad \cos(\phi) = \pm \frac{1}{\sqrt{2}} \]](https://soloferat.biz.id/images/-cos2phi--frac12-quad-rightarrow-quad-cosphi--pm-frac1sqrt2-.jpg)
