[問題] 兩題數學題目
(1)
三角形ABC的角C=90度,2cosA+3cosB=3,那sinA/sinB等於多少
A:5/12
(2)
sinA^3+cosA^3=1 那
sinA+cosA等於多少? A:1
sinA^4+cosA^4等於多少? A:1
因為學校的講義沒給詳解
所以上來發問
謝謝各位大大
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※ 編輯: latiner123 (36.231.36.26), 09/19/2017 20:28:16
※ 編輯: latiner123 (36.231.36.26), 09/19/2017 20:29:50
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