Hi, sorry another problem with the argument of a complex number :S.

1. Calculate $\displaystyle arg z$, giving your answer in radians to 2dp, where $\displaystyle z = -1 + 2i$.

Got the answer -1.07, which is right as $\displaystyle -\pi\leq-1.07\leq\pi$, yet the answers have the answer as $\displaystyle \pi + -1.07$.

Is this something I am missing, or just an odd answer?

Thanks in advance