1-cos^2(A)cos^2(B)+sin^2(A)sin^2(B)求化简AB是数
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1-cos^2(A)cos^2(B)+sin^2(A)sin^2(B)求化简AB是数
1-cos^2(A)cos^2(B)+sin^2(A)sin^2(B)求化简
AB是数
1-cos^2(A)cos^2(B)+sin^2(A)sin^2(B)求化简AB是数
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)
1-cos^2(A)cos^2(B)+sin^2(A)sin^2(B)=1-cos(A+B)cos(A-B)
1-(cos^4+sin^4)AB
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