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Bài 2. Phương trình lượng giác cơ bản (tiết 2)

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KIM TRA BI CU
1.

( )
 


x
x k
k
x k
α
α π
π α π
=
= +

⇔ ∈

= − +

¢
⇔
( )
 
 
x a k
x a k
k
π


π π
= +


= − +

∈¢




( )





x k
k
x k
π
π
π
π

= +





= +


¢
 



 




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 %
 %4
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;4
EF67AC9
BG49
&:8;45
*HIJ+
**KLMN
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<=
FOOPQ

4D
R
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DU∀

 !"#$%&'()*+,)&-'.)!/00(1)2*3
 %
 %4
R
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DU∀
R
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FOOV589:4
:49<=
α
WXY−αFW

X
;
Z
ZX
[X
AM = α vµ AM′ = − α
F9\:
4
]95\:
<=

)>??<^?_4:
:8;4
E)?9\:
4]9`
\:B5
E&:8;45
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\:a9b<πQ<∈c

 %
 %4
R
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DU∀
R
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 !"#$%&'()*+,)&-'.)!/00(1)2*3
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%449
5:4=
 !
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⇔(')*π+*∈,
-.%/&01"&1"
⇔01"(1")*π1*∈,"
FBDCdefBGB4
524g?\TA3

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l
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+*∈,
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α π
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=$
(&)*π+*∈,


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 %
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2"&&3
6
/(3
6
)*456
6
+*∈,
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(&)*π+*∈,
e3*STBgh
E45A\:<πQ<∈c
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l
4 a
α π
α
≤ ≤


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 %
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34 342 3 4

 
3 42 l 3 34
 
a x b x x
c c x d x
π
= − =
+ = =

( )

34


4 

d x
x k k
π
=
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( )
( )

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l l
l l l
l
l l

3  4l >

42 l 3 4l
l l ql
ql
ql ql
c v c n n
c x c
x k k
x k
k
x k
=
+ =
⇔ + = ± + ∈

=
⇔ ∈

= − +

¢
¢
( )

( )
3 42 3 4
 


 
b c x x
x x k k
x k
k
x k
π
π π
π π
π π
− =
⇔ − = ± + ∈
= +


⇔ ∈

= +

¢
¢
( )

3  4
 

>  

a v c
n k k
π
π
π
=
± + ∈¢

 !"#$%&'()*+,)&-'.)!/00(1)2*3
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l
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α π
α
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