SOLUTION: calculate (cos θ + i*sin θ)^4 in two different ways, and obtain identities for cos 4θ and sin 4θ.

Question 283747: calculate (cos θ + i*sin θ)^4 in two different ways, and obtain identities for cos 4θ and sin 4θ.
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
Hint: the first way is to expand the by either binomial expansion or just remembering that

The second way is to use De Moivre's theorem which states that for any complex number 'x' and integer 'n'.
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