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Problem
Problem
If
g
(
x
)
=
cos
x
,
h
(
x
)
=
log
(
x
+
x
2
+
1
)
g(x) = \cos x, h(x) = \log(x + \sqrt{x^2 + 1})
g
(
x
)
=
cos
x
,
h
(
x
)
=
lo
g
(
x
+
x
2
+
1
)
, then
f
(
x
)
=
g
(
h
(
x
)
)
f(x) = g(h(x))
f
(
x
)
=
g
(
h
(
x
))
is (a) an even function (b) an odd function (c) neither an even nor odd function (d) none of these
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