Tính giá trị
B= \(\sqrt{2+\sqrt{3}}.\sqrt{2+\sqrt{2+\sqrt{3}}}.\sqrt{2+\sqrt{2+\sqrt{2+\sqrt{3}}}}.\sqrt{2-\sqrt{2+\sqrt{2+\sqrt{3}}}}\)
C=\(\sqrt{21+\sqrt{41}}.\sqrt{5+\sqrt{4+\sqrt{41}}}.\sqrt{3+\sqrt{4+\sqrt{4+\sqrt{41}}}}.\sqrt{3-\sqrt{4+\sqrt{4+\sqrt{41}}}}\)