$i^{-49}$ এর মান-

The imaginary number $i$ is defined such that $i^2=-1$. What is the value of $(1 - i \sqrt {5}) ( 1 + i\sqrt {5})$?

$(1 + i)^8 + (1 -i)^8 =$

$A+i B=\frac{2-i 3}{5-i 4}$ হলে, $\mathrm{B}$ এর মান কোনটি?

$\sqrt{i}+\sqrt{-i}=?$