The celebrated Professor John David Jackson, would it be possible that you made a tiny careless mistake??
Every solution I've found made some unnatural twist so as to obtain your formula..... Is it really unnatural, or I am wrong?????
用全日都做唔倒兩題數,聽日得個半鐘,係唔係真係得架?
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(Another hour later)
He is damn right..... only that I don't know why I am wrong..... one missing factor can translate to castastrophe..... it appears largely correct, but it is still wrong.....

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