Practice problem
Evaluate for some complex number z=a+biz=a+biz=a+bi: zz‾z\overline{z}zz
a2+b2a^2+b^2a2+b2
a2−b2a^2-b^2a2−b2
a2+b2\sqrt{a^2+b^2}a2+b2
a2−b2\sqrt{a^2-b^2}a2−b2
Type a concept, like “slope” or “photosynthesis”.
