来自崔希波的问题
已知sin(π6−a)=13,则cos(2π3+2a)的值是()A.-79B.-13C.13D.79
已知sin(π6−a)=13,则cos(2π3+2a)的值是()
A.-79
B.-13
C.13
D.79
1回答
2020-06-15 23:25
已知sin(π6−a)=13,则cos(2π3+2a)的值是()A.-79B.-13C.13D.79
已知sin(π6−a)=13,则cos(2π3+2a)的值是()
A.-79
B.-13
C.13
D.79
cos(2π3