f
'
(
x
) =
|
cos
x
|
cos
x
+
|
sin
x
|
sin
x
; °
f
(
x
) =
x
-
,
0
<
x
<
, °
f
(
x
) =
-
sin
2
x
,
<
x
<
, °
f
(
x
) =
-
x
,
<
x
<
, °
f
(
x
) =
sin
2
x
-
,
<
x
<
2
, °jatketaan
2
-jaksoisesti.