sin 22 1/2 derajat adalah...

Sin 22,5° = sin (1/2. 45°)

[tex] = \sqrt{ \frac{ 1 - cos(45) }{2} } \\ = \sqrt{ \frac{ \frac{2}{2} - \frac{1}{2} \sqrt{2} }{2} } \\ = \sqrt{ \frac{2 - \sqrt{2} }{4} } \\ = \frac{1}{2} \sqrt{2 - \sqrt{2} } [/tex]