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derivative of cos^7(x)
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d
dx
(
cos
7
(
x
)
)
=
−
7
cos
6
(
x
)
sin
(
x
)
Show Steps
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d
dx
(
cos
7
(
x
)
)
=
−
7
cos
6
(
x
)
sin
(
x
)
steps
d
dx
(
cos
7
(
x
)
)
show steps
Apply
the
chain
rule
:
7
(
cos
(
x
)
)
6
d
dx
(
cos
(
x
)
)
=
7
(
cos
(
x
)
)
6
d
dx
(
cos
(
x
)
)
show steps
d
dx
(
cos
(
x
)
)
=
−
sin
(
x
)
=
7
(
cos
(
x
)
)
6
(
−
sin
(
x
)
)
Simplify
=
−
7
cos
6
(
x
)
sin
(
x
)
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