(1,0 ®IÓM) 0 , HΜM SÈ ®· CHO CÃ
2. (1,0 ®iÓm)
0
, hµm sè ®· cho cã:
f
′
(
x
)
=
1
−
2
sin
x
;
XÐt trªn ®o¹n
⎥⎦
⎤
⎢⎣
⎡
π
;
2
0,50
f
′
=
⇔
=
π
.
)
(
x
0
x
4
;
f
=
π
=
π
+
π
=
π
.
2
f
2. (1,0 ®iÓm)
0
, hµm sè ®· cho cã:
f
′
(
x
)
=
1
−
2
sin
x
;
XÐt trªn ®o¹n
⎥⎦
⎤
⎢⎣
⎡
π
;
2
0,50
f
′
=
⇔
=
π
.
)
(
x
0
x
4
;
f
=
π
=
π
+
π
=
π
.
2
f