=4cos^4x+4sin^4x+8cos^2x*sin^2x-8cos^2x*sin^2x-3
=4(cos^2x+sin^x)^2-8cos^2x*sin^2x-3
=1-8cos^2x*sin^2x
=1-2(sin2x)^2
=cos4x
=sin(-4x+π/2)
Y＜0就是
cos4x<0
2kπ+π/2<4x<2kπ+3π/2
kπ/2+π/8
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