Cho z1 = 1 + i; z2 = căn 2 - căn 2.i. Viết z1/z2 dưới dạng

A. $\frac{\sqrt{2}}{2}\left(\cos \frac{-\mathrm{\pi }}{2}+i.\sin \frac{-\mathrm{\pi }}{2}\right)$

B. $\frac{\sqrt{2}}{2}\left(\cos \frac{-\mathrm{\pi }}{4}+i.\sin \frac{-\mathrm{\pi }}{4}\right)$

C. $\frac{\sqrt{2}}{2}\left(\cos \frac{\mathrm{\pi }}{4}+i.\sin \frac{\mathrm{\pi }}{4}\right)$

D. $\frac{\sqrt{2}}{2}\left(\cos \frac{\mathrm{\pi }}{2}+i.\sin \frac{\mathrm{\pi }}{2}\right)$