Cosinus kąta ostrego jest równy . Wtedy
sinα=1213\displaystyle \sin\alpha= \frac{12}{13} sinα=1312\displaystyle \sin\alpha= \frac{12}{13}
sinα=113\displaystyle \sin\alpha= \frac{1}{13} sinα=131\displaystyle \sin\alpha= \frac{1}{13}
sinα=513\displaystyle \sin\alpha= \frac{5}{13} sinα=135\displaystyle \sin\alpha= \frac{5}{13}
sinα=25169\displaystyle \sin\alpha= \frac{25}{169} sinα=16925\displaystyle \sin\alpha= \frac{25}{169}
ea30e7b2-423b-4a9a-b796-8842a9082fee
(nowa formuła)
