Mathematics
Senior High
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1番、どこから41度がくるんですか?
238 (1) sin49° =sin(90°-41°) =cos41°
(2) cos61° = cos(90°-29°) =sin 29°
1 OA=
(3) tan77° = tan(90°-13°)
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あ、公式使うやつでしたか…。ありがとうございます。