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Mathematics
Mathematics
Problem
If
a
<
0
a < 0
a
<
0
, the function
f
(
x
)
=
e
a
x
+
e
−
a
x
f(x) = e^{ax} + e^{-ax}
f
(
x
)
=
e
a
x
+
e
−
a
x
is monotonically decreasing for all values of
x
x
x
, where- (A)
x
>
0
x > 0
x
>
0
(B)
x
<
0
x < 0
x
<
0
(C)
x
>
1
x > 1
x
>
1
(D)
x
<
1
x < 1
x
<
1
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