Cho ba tia Ou, Ov, Ow bất kì. Chọn phát biểu đúng?

(Ou, Ov) + (Ov, Ow) = (Ou, Ow) + k2π (k \(\in\) \(\mathbb{Z}\)).

(Ou, Ov) + (Ow, Ov) = (Ou, Ow) + k2π (k \(\in\) \(\mathbb{Z}\)).

(Ou, Ov) (Ov, Ow) = (Ou, Ow) + k2π (k \(\in\) \(\mathbb{Z}\)).

(Ov, Ou) + (Ov, Ow) = (Ou, Ow) + k2π (k \(\in\) \(\mathbb{Z}\)).