cosx + 10sinx = 0.394
求x
答案應該是 x = 3.463度
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抱歉 少一個負號
cos(-3.463) = 0.99817
sin(-3.463) = -0.0604
cos(-3.463) + 10sin(-3.463) = 0.998 - 0.604 = 0.394
不太清楚這兩組答案的關係?
※ 編輯: ksxo (118.167.40.198), 12/24/2015 00:55:27
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