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th
ng ng
n nhi th sin
Anh mt
Bng lc gia khong
t em cha bao n s
m
hi t mt n hoa bi ri
i! anh ng-
Sinh nht em anh t
t
n em thn thc
i c
nghim duy nht
I.
1. i s
a.
b.
6. Biu di
a.
TCT
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2
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b.
c.
d. -
e.
f.
7. nh bi
(0 )
2
sd AM
2. Biu di
000
7
390 , 225 , 750 ,
2
3.
trong mng hp sau:
1
. cos , sin 0
8
a
13
. sin ,
3 2 2
b
. cot 6, 2
2
c
1 cos 1 sin cos 1
cos
sin cos 1 cos
x x x
Fx
x x x
5. Chng minh rng:
4 4 2
. sin cos 2sin 1a x x x
4
24
21
.1 tan 0
cos cos
bx
xx
2
2
2
1 cos
. 1 2cot
1 cos
x
6. u thc sau:
sin( ) cos( ) sin( ) cos( )
22
A x x x x
tan( ) cot( ) tan( ) cot( )
22
B x x x x
sin( ) cos( ) sin( ) cos( )
2
C x x x x
TCT
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3
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tan( ) cot( ) tan(5 ) cot(7 )
22
F
0 0 0
tan2 tan 4 tan88H III.
8. n:
3sin cos , sin cosy x x y x x
9. a m sau:
. 4sin 2 3a y x
. 2cos( ) 1
3
b y x
. 2 sin 3c y x
2
. sin 2sin 5d y x x IV. BI
10.
0 0 0 0 0 0 0 0 0 0 0 0
. ính:sin3 cos7 cos50 sin7 cos3 cos50 sin50 cos3 cos7 sin3 sin7 sin50cT
sin( )
. tan tan tan tan tan tan
cos cos cos
abc
d a b c a b c
abc
e.
2 2 2
sin sin sin ( ) 2 2cos cos cos( )x y x y x y x y
14. m:
2
. sin sin 0a x x m
2
. sin cos sin cos 2 1 0b x x x x m
15. Chng minh rng:
. cot tan 2cot2a x x x
cos( ) 2cos( ) 3cot tan
. cot tan 2
2 2 sin2 sin2
a a a
f
aa
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cos cos3 cos5
. cot3
sin sin3 sin5
a a a
ga
a a a
12
.
cos2
( ) ( )
d.
e.
f.
g.
h.
i.
17. Cho
i.
j.
19. u thc sau:
f.
g.
h.
i.
a.
b. cos )
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21. Cho
j.
k. sin(a+b+c)
l. (a+b+c)
m.
n.
o.
p.
23. Bing:
a.
24. n:
a.
b.
c.
f.
g.
25. Chng minh rng:
a.
b.
c.
TCT
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6
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d.
| | 1m
1:sin 1 2
2
1:sin 1 2
2
0:sin 0
m x x k
m x x k
m x x k
sin
:
2
sin sin sin
2
xk
x m x
6
) sin sin sin( )
7
26
2
6
arcsin1/3 2
) sin 1/3
arcsin1/3 2
xk
a x x
xk
xk
b x x
xk
cos
:
cos cos cos 2x m x x k
cos arccos 2x m x m k
VD2:
3
) cos cos cos 2
2 6 6
) cos 1/3 arccos1/3 2
a x x x k
b x x k
3. tanx=m
tan
cot
:
cot cot cotx m x x k
.
cot arccotx m x m k
.
VD4:
1
) cot cot cot
33
3
) cot 8 arccot8
a x x x k
b x x k
tan
2
x
t
22
sin sin cos .cos 0a x b x x c x d
2
2
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3 2 2 3
sin sin cos sin cos cos sin cos 0a x b x x c x x d x m x n x
3
(2)
c 3. Gii (2)
i xng v
Dng:
t
3.
4.
5.
vi
10.
11.
0
45
12.
18.
19.
20.
21.
p 2: Gi
1. Sin(3x+20
0
) + sin4x = 0.
2. 2sin2x + 5cosx = 0.
3. sin
2
(2x + 1) =
) + tg
2
2x = 0.
10. tg4xtgx = -1.
11. cosxcos2xcos4xcos8x =
16
1
.
12.
1801693
4
cos
2
xxx
.
13.
180016093
8
cos
2
xxx
.
4.
9.
5. 10.
p 2:
1.
22
2 4 2 0sin x cos x sinx
2
22
(3 ) 3 3 ( 3 ) 2 0
22
cos x cos x cos x
3
( ; )
22
x
6.
2
2
(1 )tan 1 3 0a x a
cosx
a) Gii
1
2
a
m
(0; )
2
x
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c:
n ca cos.
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Thc hic:
Bước 1: Vi
(2)
Bước 3. Gi.
P
1.
2.
3.
4.
5.
44
4( ) 3 4 2sin x cos x sin x
ng cp bc 2:
(1)
: Chia hai Thc hic:
Bước 1. Vi cosx=0
ng a=d
- Nn
m.
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- Nn
m.
Bước 2. V
c :
b.sin2x+(c-a)cos2x=d-c-a (3)
c nht c
P
1.
2.
3.
4.
5.
(1)
Thc hic:
Bước 1. Vi
ng a=0.
- Nn
m.
- Nn
m.
Bước 2. Vi
Chia hai v c
c
6.
7.
8.
9.
10.
1
sin cos
2
t
xx
c:
(2)
c 3. Gii (2) theo t.
P
16.
2
(1 )( )
2
sinxcosx sinx cosx
17.
1 1 10
3
cosx sinx
cosx sinx
2
cos x cos x cos x
b.
2 2 2 2
3 4 5 6sin x cos x sin x cos x TCT
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c.
33
4 3 4 3 3 3 4 3cos xsin x sin xcos x cos x
d.
e.
a.
b.
c.
d.
33
2 2 2sin x sinx cos x cosx cos x
3. Chia 2 v
vng cp bc n.
a.
a. b.
m
a.
b.
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c.
d.
c)
t
a)
b)
c)
2 2 2 2 2 2
tan .tan 3 .tan 4 tan tan 3 tan 4x x x x x x
f)
2
2
3
3tan (tan ) 1 0x m x cotx
sin x
m
u kin
a)
b)
c)
10. Hp nghi ng. m thuc [1; 100] c
a)
12 tuyi:
a.
3 2| | 2cosx sinx
b.
| | 3 0cosx sin x
c.
| | | | 2sinx cosx sinx cosx
13. H
a.
2
3
sin 3
xy
sinx y
b.
22
2
sinx y
cosx y
d.
1
cos
4
3tan tan
sinx y
xy
h m duy nht
NG HP
1. - 1999]:
3
sin 4sin cos 0x x x
.
2. - 1998]:
2 2 2
sin cos 2 cos 3x x x
.
3. - 2001]:
22
2cos2 sin cos cos sin 2(sin cos )x x x x x x x
4. [HVKTQS - 1999]:
33
2sin sin 2cos cos cos2x x x x x
.
5. - 1996]:
3 3 2 5
(sin sin3 cos cos3 ) cos 2x x x x x
.
6. - 1961]:
xx
.
14. [-2001]:
2sin2 cos2 7sin 2cos 4x x x x
.
15. - 1999]:
3
(sin cos ) 4sinx x x
.
16. [BCVT - 1999]:
sin 3 sin2 sin
44
x x x
.
17. [QHQT - 2000]:
cos cos3 2cos5 0x x x
.
TCT
0976853538
22. [HVQY - 1997]:
88
1
sin cos
8
xx
23. - 2001]: 3tanx + 2cot2x = tan2x
24. - 1999]:
22
sin 4 cos 6 sin(10,5 10 )x x x
25. - 2000]:
tan 3cot 4(sin 3cos )x x x x
26. - 1998]:
1
2tan cot2 2sin2
sin2
x x x
x
27. 71]:
2
3tan3 cot2 2tan
:
33
cos sinx x m
32. - m:
66
cos sin sin 2x x m x
33. (HVQY - m:
cos2x + (m + 1) sinx + m = 0
34. m:
TCT
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22
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sin2x + sinx + cosx + m = 0
35. m:
2
2
1
tan 2(tanx+cotx) 0
sin
xm
x
36. m
2sin x+1
sin 2
m
x
.
40. m thuc khong
-3
( , )
4
c:
2 2 2 2
sin sin cos cos cos sina x a x a x a x x x
.
41. m:
66
sin cos |sin2 |x x m x
.
42.
2
sin2 2 2cos 2 sin (1)
2sin cos2 sin2 2 sin cos 1 (2)
a x x a x
x x x b b x x
cos sin 2
x
y
xx
.
- :
(2sin cos )(2cos sin )y x x x x
.
t - :
20 20
sin cosy x x
.
:
5cos cos5 , [- /4; /4]y x x x
.
:
sin cosy x x
.
- :
2
cos , 0;
4
y x x x