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Expansion of sin ^(n) theta & cos ^(n) theta # Trigonometry # Allied mathematics -1
If z = cos θ + i sin θ then z^n+1/z^n = 2 cos nθ and z^n -1/z^n = 2 i sin nθ || Complex Numbers
Simple explanation of sin, cos and tan functions in trigonometry...
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なぜ Sin (90 シータ) = Cos (シータ) なのでしょうか?
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