数据有错误:tan89.999999982=3183098861.8379067152729555123282...

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已知:直角△ABC，∠B=90°∠A=89.999999982°，直角边AB=1，斜边AC，BD垂直AC
BC=1*tan89.999999982°
BD=AB*BC/AC，CD=√(BC^2-BD^2)
求证BC+CD)*(BC-CD)=BD^2
数据检验和验证BC+CD)*(BC-CD)≠BD^2
数据有错误tan89.999999982=3183098861.8379067152729555123282...

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红树

tan89.999999982=3183098861.8379067152729555123...
BD=0.99999999999999999995065197799455320690623341621326092114524866908723013024197791177439275148402426414653984870783024344639865909322347...
BD^2=0.99999999999999999990130395598910641381490205970237190322136828860861225058032305056371137321998681216599196138879770810469858521064721676642266632407...
CD=3183098861.8379067151158758796511378041564099121402262011362216291068806599788451222059188403431599204890758932734079942012158313679...