Mathematics
Senior High

cosnπ=(-1)n乗になるのはなんでですか?
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205 次の無限級数の和を求めよ。 NN ヌ ほ)cm 7 ヵ三1
数3

Answers

n=1 cosπ=-1
n=2 cos2π=1
n=3 cos3π=-1

となるのでcosnπ=(-1)^nと扱えます

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