[Solved] What is exp(ja) equal to, where j is the square root of unity?

Q.	What is exp(ja) equal to, where j is the square root of unity?
A.	cos ja + jsin a
B.	sin a + jcos a
C.	cos j + a sin j
D.	cos a + jsin a
Answer» D. cos a + jsin a
Explanation: this is the corollary of demoivre/euler’s theorem.

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