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Problems
If
f
(
x
)
=
lim
t
→
0
[
2
x
π
⋅
tan
−
1
(
x
t
2
)
]
f(x) = \lim_{t \to 0} \left[ \frac{2x}{\pi} \cdot \tan^{-1} \left( \frac{x}{t^2} \right) \right]
f
(
x
)
=
lim
t
→
0
[
π
2
x
⋅
tan
−
1
(
t
2
x
)
]
…
Problem
If
f
(
x
)
=
lim
t
→
0
[
2
x
π
⋅
tan
−
1
(
x
t
2
)
]
f(x) = \lim_{t \to 0} \left[ \frac{2x}{\pi} \cdot \tan^{-1} \left( \frac{x}{t^2} \right) \right]
f
(
x
)
=
lim
t
→
0
[
π
2
x
⋅
tan
−
1
(
t
2
x
)
]
, the
f
(
1
)
f(1)
f
(
1
)
is .....
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