与cos13π/3的值相同的是 :A.nπ/3 B.sinπ/4 C.sinπ/6

问题描述:

与cos13π/3的值相同的是 :A.nπ/3 B.sinπ/4 C.sinπ/6

C.sinπ/6 cos13π/3= cosπ/3=sinπ/6