Mathematics
Senior High
なぜcosα>0といえるのですか？
| 0ぐ夜栗5 ーー 人ユ
13 2 5
cosg> 0 であるから coseテ1一sin?o EE =二
: ah ょPOKCMSee24
よっで sin2o三2sinocosg三2 OR [個
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