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Mathematics
Problem
The three functions
u
(
x
)
=
sin
x
+
x
u(x)=\sin x + x
u
(
x
)
=
sin
x
+
x
,
v
(
x
)
=
cos
x
+
1
v(x)=\cos x + 1
v
(
x
)
=
cos
x
+
1
, and
w
(
x
)
=
−
sin
x
w(x)=-\sin x
w
(
x
)
=
−
sin
x
are graphed without labels. Exactly one of these functions is the second derivative of another of the three. Identify the function that must be a second derivative.
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