Tính \( C = \sqrt{49 - 12\sqrt{5}} - \sqrt{49 + 12\sqrt{5}} \), \( D = \sqrt{29 + 12\sqrt{5}} - \sqrt{29 - 12\sqrt{5}} \)

----- Nội dung ảnh -----
c) \( C = \sqrt{49 - 12\sqrt{5}} - \sqrt{49 + 12\sqrt{5}} \)

d) \( D = \sqrt{29 + 12\sqrt{5}} - \sqrt{29 - 12\sqrt{5}} \)