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Let x²+y²=1; u²+v²=1 and xu+yv=0, then 1. x²+u²=1 2. y²+v²=1 3. xy+uv=0 Which of the above is/are true?

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Let x²+y²=1; u²+v²=1 and xu+yv=0, then1. x²+u²=12. y²+v²=13. xy+uv=0 Which of the above is/are true?
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