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 Jul7 awarded Organizer Jul7 revised Calculate $\sum_{k=1}^n \frac 1 {(k+1)(k+2)}$ I add an [homework] tag based on "I have homework questions". Jul7 suggested approved edit on Calculate $\sum_{k=1}^n \frac 1 {(k+1)(k+2)}$ Feb11 awarded Popular Question Mar19 accepted How to calculate volume of $z = 0, z = 1, x+y+z=2, x = 0, y = 0$ area by tripple integral? Mar18 asked How to calculate volume of $z = 0, z = 1, x+y+z=2, x = 0, y = 0$ area by tripple integral? Mar8 awarded Suffrage Mar7 revised How to analyze limit of function sequences? added 13 characters in body Mar7 asked How to analyze limit of function sequences? Jan21 awarded Scholar Jan21 accepted How to integrate by using imaginary and real part of $e^{ix}$ Jan16 awarded Benefactor Jan10 awarded Promoter Jan7 revised How to integrate by using imaginary and real part of $e^{ix}$ added 18 characters in body Jan7 awarded Editor Jan7 revised How to integrate by using imaginary and real part of $e^{ix}$ added 97 characters in body Jan7 awarded Student Jan7 asked How to integrate by using imaginary and real part of $e^{ix}$ Dec12 comment Why study linear algebra? It is very useful in linear control theory. Systems are described by so called state which is vector and change of state is described by matrices. Than questions about stability becomes questions about eigenvalues. etc. Dec11 awarded Supporter