Mathematics
Senior High
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数2の問題です。なぜcos225°が-√2\1になるのか分かりません。解説お願い致します。
325
1-cos225°
sin? 112.5° =
2
0Sao-!
S1-
0S20=
11
12
2+V2
2
4
OSS
0 sin112.5° >0 より
6S20 +1
2+/2
2
0Seoo-1%= (Sin l12.5° =
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