Cho \(\sin \alpha  = {1 \over {\sqrt 3 }},\,\,\lef...

Câu hỏi: Cho sinα=13,(0<α<π2)sinα=13,(0<α<π2). Tính cos(α+π3)=?cos(α+π3)=?

A 2323

B 1313

C 636636

D 6+366+36