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Fig. 2.
Approximations
R
n
(
h
;
x
,
y
)
and
P
n
(
h
;
x
,
y
)
of
h
(
x
,
y
)
=
x
2
−
sin
(
y
−
x
)
.
Kyungpook Mathematical Journal 2022;62:467~484
https://doi.org/10.5666/KMJ.2022.62.3.467
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