y=cos(cos−121+cos−12x)y=21×2x−1−411−4x24y=x−34−x23(4−x2)=x2+16y2−8xy12−3x2=x2+16y2−8xy4x2+16y2−8xy=12x2+4y2−2xy=3x2+y2−2xy−3y2=3(x−y)2+3y2=3
If y=cos(3π+cos−12x), then (x−y)2+3y2 is equal to _____.
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