Jeżeli oraz , to
cosα=12\displaystyle \cos\alpha= \frac{1}{2} cosα=21\displaystyle \cos\alpha= \frac{1}{2}
cosα=22\displaystyle \cos\alpha= \frac{\sqrt{2}}{2} cosα=22\displaystyle \cos\alpha= \frac{\sqrt{2}}{2}
cosα=32\displaystyle \cos\alpha= \frac{\sqrt{3}}{2} cosα=23\displaystyle \cos\alpha= \frac{\sqrt{3}}{2}
cosα=1\cos\alpha=1cosα=1\cos\alpha=1
74794b6e-8d4b-4d28-b2d6-dd86420d1f19
(nowa formuła)
