sin2A=(1-cos2A) /2,cos2A=(1+cos2A)/2 对还是cos^2(A)= [1 + cos2A]/2 ,sin^2(A)= [1 - cos2A]/2一个是乘以二 一个是二次方
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![sin2A=(1-cos2A) /2,cos2A=(1+cos2A)/2 对还是cos^2(A)= [1 + cos2A]/2 ,sin^2(A)= [1 - cos2A]/2一个是乘以二 一个是二次方](/uploads/image/z/2981239-7-9.jpg?t=sin2A%3D%281-cos2A%29+%2F2%2Ccos2A%3D%EF%BC%881%2Bcos2A%EF%BC%89%2F2+%E5%AF%B9%E8%BF%98%E6%98%AFcos%5E2%EF%BC%88A%EF%BC%89%3D+%5B1+%2B+cos2A%5D%2F2+%2Csin%5E2%EF%BC%88A%EF%BC%89%3D+%5B1+-+cos2A%5D%2F2%E4%B8%80%E4%B8%AA%E6%98%AF%E4%B9%98%E4%BB%A5%E4%BA%8C+%E4%B8%80%E4%B8%AA%E6%98%AF%E4%BA%8C%E6%AC%A1%E6%96%B9)
sin2A=(1-cos2A) /2,cos2A=(1+cos2A)/2 对还是cos^2(A)= [1 + cos2A]/2 ,sin^2(A)= [1 - cos2A]/2一个是乘以二 一个是二次方
sin2A=(1-cos2A) /2,cos2A=(1+cos2A)/2 对还是cos^2(A)= [1 + cos2A]/2 ,sin^2(A)= [1 - cos2A]/2
一个是乘以二 一个是二次方
sin2A=(1-cos2A) /2,cos2A=(1+cos2A)/2 对还是cos^2(A)= [1 + cos2A]/2 ,sin^2(A)= [1 - cos2A]/2一个是乘以二 一个是二次方
sin2A=2sinAcosA
cos2A=cos²A-sin²A=2cos²A-1=1-2sin²A ====>>>>> sin²A=(1/2)(1-cos2A);cos²A=(1/2)(1+cos2A)