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Tanh
t
a
n
h
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x
)
=
e
x
−
e
−
x
e
x
+
e
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x
\rm {tanh}(x) = \frac {e^x - e^{-x}} {e^x + e^{-x}}
tanh
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x
)
=
e
x
+
e
−
x
e
x
−
e
−
x
t
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′
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1
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t
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2
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x
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\rm {tanh}^{\prime}(x) = 1-\rm {tanh}^2(x)
tanh
′
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x
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=
1
−
tanh
2
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x
)
