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derivative of cospi x
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d
dx
(
cos
(
π
)
x
)
=
−
1
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d
dx
(
cos
(
π
)
x
)
=
−
1
steps
d
dx
(
cos
(
π
)
x
)
show steps
Simplify
cos
(
π
)
x
:
−
x
=
d
dx
(
−
x
)
Take
the
constant
out
:
(
a
·
f
)
′
=
a
·
f
′
=
−
dx
dx
Apply
the
common
derivative
:
dx
dx
=
1
=
−
1
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