- #1
DryRun
Gold Member
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- 4
Homework Statement
I could not type it here, so i made a screenshot and posted it below.
Homework Equations
it's about complex numbers undergraduate level. I'm currently doing Euler's formula and De Moivre's theorem, although I'm not sure that the solution lies there.
The Attempt at a Solution
i tried doing it by adding the values inside the cos() but when verifying via calculator with a dummy data, it didn't add up.