Recent content by coreanphysicsstudent

Can you inform why (*) is wrong, and the correct method.

--------------------------------------------------------------------------------------------- Well Thank you for your advice. I wil learn LaTex sooner or later. But I really don't understand your answer, it's quite difficult that using arg. I don't have any ideas of arg method.here's my method...

but the real answer is −1, (1±i√3)/2 What's wrong with my solution? please help me through.