sin^2 22.5度-cos^2 22.5度=
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sin^2 22.5度-cos^2 22.5度=
sin^2 22.5度-cos^2 22.5度=
sin^2 22.5度-cos^2 22.5度=
sin^2 22.5度-cos^2 22.5度= -(cos^2 22.5度-sin^2 22.5度)=-cos45度=-√2/2
45
sin² 22.5°-cos² 22.5°=-cos45°=-0.7071
sin^222.5-(1-sin^222.5)=2sin^222.5-1=-(1-2sin^222.5)=-cos45度=-根2/2