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Problem
Problem
The number of critical points of
f
(
x
)
=
max
{
sin
x
,
cos
x
}
,
∀
x
∈
(
−
2
π
,
2
π
)
f(x) = \max \{\sin x, \cos x\}, \forall x \in (-2\pi, 2\pi)
f
(
x
)
=
max
{
sin
x
,
cos
x
}
,
∀
x
∈
(
−
2
π
,
2
π
)
, is a. 5 b. 6 c. 7 d. 8
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