section_heading: Konstrukcija pravilnog sedamnaesterokuta
paragraph_text: <math>\operatorname{cos}{2\pi\over17}=\frac{1}{16} \left( -1 + \sqrt{17} + \sqrt{ 2 \left(17- \sqrt{17} \right)} + 2 \sqrt{ 17 + 3 \sqrt{17} - \sqrt{2 \left(17- \sqrt{17} \right)} - 2 \sqrt{2 \left(17+ \sqrt{17} \right)} } \right).</math>