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【余弦值互为相反数的两个角相差多少度】
余弦值互为相反数的两个角相差多少度
1回答
2020-07-23 05:25
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韩新明
设0≤A1≤π/2cosA1=a
cosA2=-a
cosA2=-cosA1
A2=2kπ＋π-A1
或
A2=2kπ＋π+A1
A2-A1=2kπ＋π-2A1
或
A2-A1=2kπ＋π
2020-07-23 05:27:43
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