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Question-46208




Question Number 46208 by hassentimol last updated on 22/Oct/18
Commented by hassentimol last updated on 22/Oct/18
  Could you please explain me these  three formulas but mainly the last  one as I do not understand it at all.    Could you also explain me the meaning of  these formulas ? What is their utility ?  And what do they calculate ?    It is very important for me please !  I will have soon an important test on these.
$$ \\ $$$$\mathrm{Could}\:\mathrm{you}\:\mathrm{please}\:\mathrm{explain}\:\mathrm{me}\:\mathrm{these} \\ $$$$\mathrm{three}\:\mathrm{formulas}\:\mathrm{but}\:\mathrm{mainly}\:\mathrm{the}\:\mathrm{last} \\ $$$$\mathrm{one}\:\mathrm{as}\:\mathrm{I}\:\mathrm{do}\:\mathrm{not}\:\mathrm{understand}\:\mathrm{it}\:\mathrm{at}\:\mathrm{all}. \\ $$$$ \\ $$$$\mathrm{Could}\:\mathrm{you}\:\mathrm{also}\:\mathrm{explain}\:\mathrm{me}\:\mathrm{the}\:\mathrm{meaning}\:\mathrm{of} \\ $$$$\mathrm{these}\:\mathrm{formulas}\:?\:\mathrm{What}\:\mathrm{is}\:\mathrm{their}\:\mathrm{utility}\:? \\ $$$$\mathrm{And}\:\mathrm{what}\:\mathrm{do}\:\mathrm{they}\:\mathrm{calculate}\:? \\ $$$$ \\ $$$$\mathrm{It}\:\mathrm{is}\:\mathrm{very}\:\mathrm{important}\:\mathrm{for}\:\mathrm{me}\:\mathrm{please}\:! \\ $$$$\mathrm{I}\:\mathrm{will}\:\mathrm{have}\:\mathrm{soon}\:\mathrm{an}\:\mathrm{important}\:\mathrm{test}\:\mathrm{on}\:\mathrm{these}. \\ $$

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