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Mathematics
Mathematics
Problem
Consider
f
(
x
)
=
sin
x
+
a
x
f(x)=\sin x + ax
f
(
x
)
=
sin
x
+
a
x
, where
a
∈
R
a\in\mathbb R
a
∈
R
. The function
f
f
f
is strictly increasing on
R
\mathbb R
R
when a)
a
>
−
1
a>-1
a
>
−
1
b)
a
>
1
a>1
a
>
1
c)
a
≥
1
a\ge 1
a
≥
1
d)
∣
a
∣
<
1
|a|<1
∣
a
∣
<
1
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