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d/(dt)(d/(dt)(acos(sqrt(k/m)t)))
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d
2
dt
2
(
a
cos
(
√
k
m
t
)
)
=
−
ak
cos
(
√
k
m
t
)
m
Show Steps
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d
2
dt
2
(
a
cos
(
√
k
m
t
)
)
=
−
ak
cos
(
√
k
m
t
)
m
steps
d
2
dt
2
(
a
cos
(
√
k
m
t
)
)
show steps
d
dt
(
a
cos
(
√
k
m
t
)
)
=
−
a
√
k
m
sin
(
√
k
m
t
)
=
d
dt
(
−
a
√
k
m
sin
(
√
k
m
t
)
)
show steps
d
dt
(
−
a
√
k
m
sin
(
√
k
m
t
)
)
=
−
ak
cos
(
√
k
m
t
)
m
=
−
ak
cos
(
√
k
m
t
)
m
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