Let
f
(
x
)
=
−
2
sec
(
8
x
)
\displaystyle {f{{\left({x}\right)}}}=-{2}{\sec{{\left({8}{x}\right)}}}
f
(
x
)
=
−
2
sec
(
8
x
)
f
′
(
x
)
=
\displaystyle {f}'{\left({x}\right)}=
f
′
(
x
)
=
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