Mathematics
Senior High
Resolved
最後の答えはなぜ+ルート2になるんですか？－じゃないんですか？わかる方いらっしゃったら教えてください🙇♀️
(1) sin 165°
=
= sin(135°+30°)
= sin135°cos30° + cos 135°sin 30
√3
+
=
==
2
2
√3-1
2√2
√6-√2
4
cos 165°
cos(135°+30°)
cos 135° cos 30°-sin 135° sin 30°
1
√3
1
1
2
2 m
2
2
-√3-1
2√2
=0qjal
6+√2
4
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ありがとうございます！！！助かりました！！