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(d^2)/(dx^2)(cos(kx))
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d
2
dx
2
(
cos
(
kx
)
)
=
−
k
2
cos
(
kx
)
Show Steps
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d
2
dx
2
(
cos
(
kx
)
)
=
−
k
2
cos
(
kx
)
steps
d
2
dx
2
(
cos
(
kx
)
)
show steps
d
dx
(
cos
(
kx
)
)
=
−
sin
(
kx
)
k
=
d
dx
(
−
sin
(
kx
)
k
)
show steps
d
dx
(
−
sin
(
kx
)
k
)
=
−
k
2
cos
(
kx
)
=
−
k
2
cos
(
kx
)
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