PT LG trong các đề ĐH 02-09

PHƯƠNG TRÌNH LƯỢNG GIÁC
TRONG CÁC ĐỀ THI ĐẠI HỌC TỪ 2002 ĐẾN 2009
[ĐH A02] Tìm
( )
x 0;2∈ π
:
cos3x sin 3x
5 sin x cos 2x 3
1 2sin 2x
+
 
+ = +
 ÷
+
 
[ĐH B02]
2 2 2 2
sin 3x cos 4x sin 5x cos 6x− = −
[ĐH D02] Tìm
[ ]
x 0;14∈

cos3x 4 cos 2x 3cos x 4 0
− + − =
[ĐH A03]
2
cos 2x 1
cot x 1 sin x sin 2x
1 tan x 2
− = + −
+

[ĐH B03]
2
cot x tan x 4sin 2x
sin 2x
− + =
[ĐH D03]
2 2
x x
sin tna2x cos 0
2 4 2
π
 
− − =
 ÷
 
[ĐH B04]
2
5sin x 2 3(1 sin x) tan x− = −
[ĐH D04]
( ) ( )
2cos x 1 2sin x cos x sin 2x sin x− + = −
[ĐH A05]
2 2
cos 3x cos 2x cos x 0− =

[ĐH B05]
1 sin cos x sin 2x cos 2x 0+ + + + =

[ĐH D05]

4 4
3
cos x sin x cos x sin 3x 0
4 4 2
π π
   
+ + − − − =
 ÷  ÷
   
[ĐH A06]
( )
6 6
2 cos x sin x sin x cos x
0
2 2sin x
+ −
=
−
[ĐH D06]
cos3x cos 2x cos x 1 0
+ − − =
[ĐH B06]
x
cot x sin x 1 tan x tan 4
2
 
+ + =
 ÷
 
[ĐH A07]

( ) ( )
2 2
1 sin x cos x 1 cos x sin x 1 sin 2x+ + + = +
[ĐH B07]
2
2sin 2x sin 7x 1 sin x+ − =

[ĐH D07]
2
x x
sin cos 3 cos x 2
2 2
 
+ + =
 ÷
 
[ĐH A08]
1 1 7
4sin x
3
sin x 4
sin x
2
π
 
+ = −
 ÷
π
 
 

−
 ÷
 

[ĐH B08]
3 3 2 2
sin x 3 cos x sin x cos x 3 sin x cos x− = −

[ĐH D08]
( )
2sin x 1 cos 2x sin 2x 1 2 cos x+ + = +
[CĐ 08]
sin 3x 3 cos 3x 2sin 2x− =
[ĐH A09]
(1 2sin x) cosx
3
(1 2sin x)(1 sin x)
−
=
+ −
[ĐH B09]
( )
3
sin x cos x sin 2x 3 cos 3x 2 cos 4x sin x+ + = +
[ĐH D09]
3 cos 5x 2 sin 3x cos 2x sin x 0− − =
[CĐ 09]
2
(1 2sin x) cos x 1 sin x cos x+ = + +