Art of Learning Mathematics
Saturday, 2 May 2015
Useful Limits
The General Limit Formulas
If
lim
x
→
a
f
(
x
)
=
l
and
lim
x
→
a
g
(
x
)
=
m
,then
lim
x
→
a
[
f
(
x
)
±
g
(
x
)
]
=
l
±
m
lim
x
→
a
[
f
(
x
)
⋅
g
(
x
)
]
=
l
⋅
m
lim
x
→
a
f
(
x
)
g
(
x
)
=
l
m
lim
x
→
a
c
⋅
f
(
x
)
=
c
⋅
l
lim
x
→
a
1
f
(
x
)
=
1
l
The Common Limits
lim
x
→
∞
(
1
+
1
n
)
n
=
e
lim
x
→
∞
(
1
+
n
)
1
/
n
=
e
lim
x
→
0
sin
x
x
=
1
lim
x
→
0
tan
x
x
=
1
lim
x
→
0
cos
x
−
1
x
=
0
lim
x
→
a
x
n
−
a
n
x
−
a
=
n
a
n
−
1
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