化简:2(sinA)^2(sinB)^2+2(cosA)^2(cosB)^2-cos2A(cosB)^2

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化简:2(sinA)^2(sinB)^2+2(cosA)^2(cosB)^2-cos2A(cosB)^2
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化简:2(sinA)^2(sinB)^2+2(cosA)^2(cosB)^2-cos2A(cosB)^2
化简:2(sinA)^2(sinB)^2+2(cosA)^2(cosB)^2-cos2A(cosB)^2

化简:2(sinA)^2(sinB)^2+2(cosA)^2(cosB)^2-cos2A(cosB)^2
2(sinA)^2(sinB)^2+2(cosA)^2(cosB)^2-cos2A(cosB)^2=
2(sinA)^2(sinB)^2+(cosB)^2*(2(cosA)^2-cos2A)=
2(sinA)^2(sinB)^2+(cosB)^2=
2(sinA)^2(sinB)^2+1-(sinB)^2=
1+(sinB)^2*(2(sinA)^2-1)=
1-(sinB)^2(cos2A)