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derivative of cos(xy)
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d
dx
(
cos
(
xy
)
)
=
−
sin
(
xy
)
(
y
+
x
dy
dx
)
Show Steps
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d
dx
(
cos
(
xy
)
)
=
−
sin
(
xy
)
(
y
+
x
dy
dx
)
steps
d
dx
(
cos
(
xy
)
)
show steps
Apply
the
chain
rule
:
−
sin
(
xy
)
d
dx
(
xy
)
=
−
sin
(
xy
)
d
dx
(
xy
)
show steps
d
dx
(
xy
)
=
y
+
x
dy
dx
=
−
sin
(
xy
)
(
y
+
x
dy
dx
)
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