来自施克仁的问题
已知sinα=23,则cos(3π−2α)等于()A.−53B.19C.-19D.53
已知sinα=23,则cos(3π−2α)等于()
A.−
53
B.19
C.-19
D.
53
1回答
2020-06-0917:05
已知sinα=23,则cos(3π−2α)等于()A.−53B.19C.-19D.53
已知sinα=23,则cos(3π−2α)等于()
A.−
53
B.19
C.-19
D.
53
∵sinα=23