exponential form: Write -1 - i in exponential form.

[Jen123]

Problem: Write -1-i in exponential form.

In my book it says theta= arctan b/a when a>0. but in the above equation a is -1 so how would I solve this.

 

[pka]

\(\displaystyle \L \arg \left( { - 1 - i} \right) = \arctan \left( {\frac{{ - 1}}{1}} \right) - \pi\)