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dfd04b56b8a604298b38bfad4fb915b2c6ecabc2: $$
B
9e1b1172c5f3497b235a3530b04e9249e0ce1569: $$
C_2
5a6c9bbb3559c5a79785572f3aaa77100e0cd52b: $$
R_2
7efe5606ce9d6265aa5bc375452181ee8f16c570: $$
60^{\circ}