Mathematics
Senior High
数IIの三角関数です。
写真の右辺の変形の経緯がわかりません。
教えてください🙇♀️
cos²0-sin²0
2
sin²0 + cos²0 +2sin 0 cos 0
2
(cos+sin)(cos - sin 0)
(sin 0 + cos0)²
2
cos
- sin 0
cos
+ sin 0
sin 0
1--
Cos 0
cos 0 - sin 0
右辺=
sin 0
cos
+ sin 0
1+
Cos 0
よって左辺=右辺
(3) 左辺=
(3) sin
=
=
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