\
L
a
r
g
e
\
lim
x
\
t
o
\
∈
f
t
y
\
2
x
2
+
7
3
+
\
1
x
\
h
s
p
a
c
e
2
=
\
h
s
p
a
c
e
{
5
}
+
\
∈
f
t
y