(1-cos四次方x-sin四次方x)除(1-cos六次方x-sin六次方x) 　　1-cos^4(x)-sin^4(x) 　　=sin^2(x)-sin^4(x)+cos^2(x)-cos^4(x) 　　=sin^2(x)[1-sin^2(x)]+cos^2(x)[1-cos^2(x)] 　　=sin^2(x)cos^2(x)+cos^2(x)sin^2(x) 　　=2sin^2(x)cos^2(x) 　　(1-cos六次方x-sin六次方x) 　　=[1-(cos^6(x)+sin^6(x)] 　　=[cos^2(x)-cos^6(x)+sin^2(x)-sin^6(x)] 　　={cos^2(x)[1-cos^4(x)]+sin^2(x)[1-sin^4(x)] 　　={cos^2(x)[sin^2(x）+cos^2(x)【1-cos^2(x)】+sin^2(x)[cos^2(x)+sin^2(x)【1-sin^2(x)】} 　　={cos^2(x)[sin^2(x)+sin^2(x)cos^2(x)]+sin^2(x)[cos^2(x)+sin^2(x)cos^2(x)]} 　　=sin^2(x)cos^2(x)[1+cos^2(x)+1+sin^2(x)] 　　=3sin^2(x)cos^2(x) 　　(1-cos四次方x-sin四次方x)除(1-cos六次方x-sin六次方x) 　　=2sin^2(x)cos^2(x)/3sin^2(x)cos^2(x) 　　=2/3 　　已知0