Jawabanmu

2014-09-07T17:21:44+07:00
A + B =
(i - 2j) + (2i + 3j) =
(1 + 2)i + (-2 + 3)j =
3i + j

Sudut :
tanФ = y/x
Ф = tan⁻¹ y/x
Ф = tan⁻¹ 1/3
Ф = 15°

Semoga membantu.

2014-09-07T17:23:56+07:00