H
e
t
k
e
k
i
i
r
u
s
a
j
a
h
e
t
k
e
l
t
=
lim
h
→
0
l
ä
b
i
t
u
d
t
e
e
p
i
k
k
u
s
v
a
h
e
m
i
k
u
s
t
−
h
k
u
n
i
t
a
j
a
v
a
h
e
m
i
k
u
p
i
k
k
u
s
e
h
k
h
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