1-cos^2(A)cos^2(B)+sin^2(A)sin^2(B)求化简AB是数_数学解答

1-cos^2(A)cos^2(B)+sin^2(A)sin^2(B)求化简
AB是数

人气：246 ℃　时间：2020-06-03 05:20:59

解答

1-cos^2(A)cos^2(B)+sin^2(A)sin^2(B)=1+(sinAsinB+cosAcosB)(sinAsinB-cosAcosB)
=1-cos(A-B)cos(A+B)