U
=
U
4
R
⋅
2
R
=
U
2
U
=
U
4
R
⋅
2
R
=
U
2
Close
Log in
Books
Repository
eAnswer
ePortfolio
Close
Log in
Books
Repository
eAnswer
ePortfolio
Log in
New user
OK
Error
Forgot?
Log in
Register
Recover
OK
Error
Change