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Mathematics
Mathematics
Problem
In the interval
[
0
,
4
π
]
[0,4\pi]
[
0
,
4
π
]
, how many distinct points are either a maximum or a minimum of the functions
y
=
sin
x
y=\sin x
y
=
sin
x
or
y
=
cos
x
y=\cos x
y
=
cos
x
? a)
8
8
8
b)
11
11
11
c)
9
9
9
d)
10
10
10
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