1) cos(2α) + sin^2(α)2) sin(100°) / (2cos(50°))3) cos(36°) + sin^2(18°) / cos^2(18°)4) sin(α) / 2sin^2(α) / 2
1) cos(2α) + sin^2(α)
2) sin(100°) / (2cos(50°))
3) cos(36°) + sin^2(18°) / cos^2(18°)
4) sin(α) / 2sin^2(α) / 2