If
f
(
x
)
=
x
cosh
x
+
4
sinh
x
\displaystyle {f{{\left({x}\right)}}}={x}{\cosh{{x}}}+{4}{\sinh{{x}}}
f
(
x
)
=
x
cosh
x
+
4
sinh
x
then
f
′
(
x
)
=
\displaystyle {f}'{\left({x}\right)}=
f
′
(
x
)
=
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