Mathematics
Senior High
Resolved
最後の2行の変形が1/2(cosπ/10−i sinπ/10)となるのは偏角の変域が0<＝θ<2πになっているからですか？
1
Z
cos0+isin0
2/cos 10
+isin
兀
10
= (cos(-1)+sin(-1))
COS
2
10
19
1/2 (cos 10/8/7 + i sin 1987)
COS
10
10
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![(2)[1]の式はなぜこうなるのでしょうか？
解説お願いします🙏🏻 - 1](https://d1e9oo257tadp1.cloudfront.net/uploads/qa_question_image/file/1810073/thumb_l_webp_1717B3E3-8A84-49A5-82D1-466207496D96.webp?Expires=1787253999&Signature=ycGV0ZAeOfK6svzgJfI18zj0Jn6lwiJBcnB6QHwqE7tuse4lmzjskaITXMxg6Jvsq28hZzGKw06pyy7baxCVkKV5pu4dOzQvJCiRkjQYrOlBadsMYVY4CjyGKXrL0PLnyT6Yeewk2oIyEdRdK9EnZwmCHWltqiyoeu2JVGj5Z0BLmXAB3Lv~ScFn-gSuOTUI~MwmGq5PHVc3~4mX9Id6-BeItDbeDKlw8YWdMNyhV3EyZMTspy~cRuKpGBEYUHTI~iGbuXzL2Evv6s2rS1Y9xKHgfjJFzzFhXUq4F5dAFpzd8cQdRBRWbHlJ4R1AAEr8pQkbWrmaPBsKxJ7pLv7uHQ__&Key-Pair-Id=K2W722D70GJS8W&Expires=1787253999&Signature=gBUYric6omFw7uicTUj8w~a0mBIkbLhUa~qfBsgx~nYh8U8S42lkhxUTf7XeAK5572xEGh3WC8KungpHVCg0KRRwbOSqI9nIThWDt2QprVqKeh1waiMm~pHbx~9YyIXt-P0CgcGhYTWdLyiYd~3IHlyb2Ne2i22Y~swzhmsUivIUWy2Z1WLPmsrdT5ZdN7Vp14GhmjIRHM9q5xttrIRwnxq4YJFs3FHNYHLUuNljsHrbnl314Jk2~vpseG2~aOuFLgXQOaLs4DWBqmlpdPZkvP6HUcnRNJ3gaCtx3d62rLdXhTKm4FKjInFXnRU1Fqb42Hukn0oUZTLsWT5~ppRv3A__&Key-Pair-Id=K2W722D70GJS8W)
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ありがとうございます