MCQ
Let $z$ be a complex number then $z+\bar{z}$ is :
- ✓pure real
- Bpure imaginary
- Cnot decided
- DNone of these
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The value of $\cot\Big(\frac{\pi}{4}+\theta\Big)\cot\Big(\frac{\pi}{4}-\theta\Big)$ is:
-1
0
1
Not defined