已知三角函数值求角的两道题1.2x-4/3π =arccos(-y)=π-arccosy中为什么arccos(-y)=π-arccosy?2.若2sin(3x+π/4)=sinx+根号3×cosx,x=?有两个答案,其中一个答案为x=kπ+5π/48,为什么
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![已知三角函数值求角的两道题1.2x-4/3π =arccos(-y)=π-arccosy中为什么arccos(-y)=π-arccosy?2.若2sin(3x+π/4)=sinx+根号3×cosx,x=?有两个答案,其中一个答案为x=kπ+5π/48,为什么](/uploads/image/z/2646681-33-1.jpg?t=%E5%B7%B2%E7%9F%A5%E4%B8%89%E8%A7%92%E5%87%BD%E6%95%B0%E5%80%BC%E6%B1%82%E8%A7%92%E7%9A%84%E4%B8%A4%E9%81%93%E9%A2%981.2x-4%2F3%CF%80+%EF%BC%9Darccos%28-y%29%EF%BC%9D%CF%80%EF%BC%8Darccosy%E4%B8%AD%E4%B8%BA%E4%BB%80%E4%B9%88arccos%28-y%29%EF%BC%9D%CF%80%EF%BC%8Darccosy%3F2.%E8%8B%A52sin%EF%BC%883x%2B%CF%80%2F4%EF%BC%89%EF%BC%9Dsinx%2B%E6%A0%B9%E5%8F%B73%C3%97cosx%2Cx%EF%BC%9D%3F%E6%9C%89%E4%B8%A4%E4%B8%AA%E7%AD%94%E6%A1%88%2C%E5%85%B6%E4%B8%AD%E4%B8%80%E4%B8%AA%E7%AD%94%E6%A1%88%E4%B8%BAx%EF%BC%9Dk%CF%80%EF%BC%8B5%CF%80%2F48%2C%E4%B8%BA%E4%BB%80%E4%B9%88)
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已知三角函数值求角的两道题1.2x-4/3π =arccos(-y)=π-arccosy中为什么arccos(-y)=π-arccosy?2.若2sin(3x+π/4)=sinx+根号3×cosx,x=?有两个答案,其中一个答案为x=kπ+5π/48,为什么
已知三角函数值求角的两道题
1.2x-4/3π =arccos(-y)=π-arccosy中为什么arccos(-y)=π-arccosy?
2.若2sin(3x+π/4)=sinx+根号3×cosx,x=?
有两个答案,其中一个答案为x=kπ+5π/48,为什么
已知三角函数值求角的两道题1.2x-4/3π =arccos(-y)=π-arccosy中为什么arccos(-y)=π-arccosy?2.若2sin(3x+π/4)=sinx+根号3×cosx,x=?有两个答案,其中一个答案为x=kπ+5π/48,为什么
1.
反余弦arccosx∈[0,π],-1≤x≤1, 当-1≤x