Find the first derivative of
f
(
x
)
=
−
6
x
3
e
x
sec
(
x
)
\displaystyle {f{{\left({x}\right)}}}=-{6}{x}^{{3}}{e}^{{x}}{\sec{{\left({x}\right)}}}
f
(
x
)
=
−
6
x
3
e
x
sec
(
x
)
.
f
′
(
x
)
=
\displaystyle {f}'{\left({x}\right)}=
f
′
(
x
)
=
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