Difficult
यदि $z = i \log (2 - \sqrt{3})$ है,तो $\cos z = $
- A$i$
- B$2i$
- C$1$
- D$2$
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सम्मिश्र संख्या $z=1+i \sqrt{3}$ को ध्रुवीय रूप में निरूपित कीजिए।
Medium
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