Draw the points A : i
and the point B: (1/(2^{0.5})) + (1/(2^{0.5}))i on a argand digram and hence find the argument of A+B i drew it but i am clueless
they the mark scheme has 3pi/8 and specifically gave no marks for using that forumla and approximating the answer to 3pi/8, they said not to use that formula, they stressed to use the argand diagram to find it, any suggestions how, i did this first but then realised that they did not accept this method..please help
i forgot to mention they want the argument exactly in terms of pi, and have no marks for find A+B and finidnging the argument from that