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
答
C.sinπ/6 cos13π/3= cosπ/3=sinπ/6
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