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Problem
Problem
Define
y
=
tanh
−
1
(
4
x
3
−
3
x
)
y = \tanh^{-1}(4x^3 - 3x)
y
=
tanh
−
1
(
4
x
3
−
3
x
)
in terms of
cos
−
1
x
\cos^{-1} x
cos
−
1
x
and also draw its graph.
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