Mathematics
Senior High
この2行目から3行目はどのように計算しますか？
(与式)
COS
2
n
2
(5x)=(cos + isin *)*+ (cos(-3)+isin (-))"
3
=(cos 23 =
+isin
3
3
3
n
S-S
2x) + (cos(-2x) + isin (-2)
2nπ
=2cos
だ
3
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