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August 29, 2015

Homework Help: Trigonometry

Posted by Drake on Sunday, June 30, 2013 at 8:58am.

Let z be a complex number such that
z=2(cos8∘+icos82∘).

Then z^5 can be expressed as r(sinα∘+icosα∘), where r is a real number and 0≤α≤90. What is the value of r+α?

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