CHO HAI VECTƠ A  2; 2 3 ,  B(3; 3). GÓC GIỮA HAI VECTƠ...

Câu 30. Cho hai vectơ

^a

^

^{ }



^{2; 2 3 ,}

^



^b

^

^

^{(3; 3)}

. Góc giữa hai vectơ

^{a b}

^,

là?

A.

⁹⁰

⁰

B.

¹⁵⁰

⁰

C.

⁴⁵

⁰

D.

¹²⁰

⁰

1

2

1

x

x







1

1