Mathematics
Senior High
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α+βの値の求め方がわかりません
基本問題■■■
264 (1) cosa=
(0)
11
=1/1/1, cosB= 14 (osas, 0≦B≦)のとき, sin (a+B),
2'
cos(α+β) の値を求めよ。 また, α+β の値を求めよ。
[03 中部大〕
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求め方を教えてください!