请帮忙翻译：I also know that Tom is older than jane but Mary isn't.

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• 请帮忙翻译：I also know that Tom is older than jane but Mary isn't.
• 请帮忙翻译：I also know that Tom is older than jane but Mary isn't.
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• 已知cos2θ=根号2/3,则 sin^4θ+cos^4θ的值为________.sin^4a＋cos^4a=(sin²a＋cos²a)²－2sin²acos²a=1－(1/2)sin²2a=1－(1/2)[1－cos²2a]=1－(1/2)[1－(2/9)]=11/182sin²acos²a=2｛（2sina cosa）/2｝²这样?.还是啥意思.2sin²acos²a=sin ² 2a?那为什么前面又要1/2.没搞懂.