65 Bài tập Phương trình lượng giác

PHƯƠNG TRÌNH LƯỢNG GIÁC.
1/ cos23x.cos2x – cos2x = 0	2/ 1 + sinx + cosx + sin2x + cos2x = 0 
3/ cos4x + sin4x + cossin - = 0 	4/ 5sinx – 2 = 3(1 – sinx)tan2x
5/ (2cosx – 1)(2sinx + cosx) = sin2x – sinx.	6/ cotx – 1 = sin2x.
7/ cotx – tanx + 4sin2x = 	8/ 
9/ với 0 < x < 2 10/ sin23x – cos24x = sin25x – cos26x
11/ cos3x – 4cos2x + 3cosx – 4 = 0 với 0 14 
12/ cosx + cos2x + cos3x = sinx + sin2x + sin3x 13/ .
14/ cos3x + sin7x = 2. 15/ sin3x + sinx.cosx = 1 – cos3x
16/ 2 + cos2x = 2tanx 17/ sinx.cosx + cos2x = 
18/ 19/ sin3x + cos2x =2 ( sin2x.cosx – 1)
20/ 4cosx – 2cos2x – cos2x – cos4x = 0 21/ 
22/ cosx + sin2x = 0 23/ 2(cos4x – sin4x) + cos4x – cos2x = 0
24/ (5sinx – 2)cos2x = 3(1 – sinx)sin2x 25/ (2sinx – 1)(2cosx + sinx) = sin2x – cosx
26/ cos3x + 2cos2x = 1 – 2sinxsin2x 27/ 
28/ sin3x + cos3x = sinx – cosx 29/ 
30/ 4cos2x – 2cos22x = 1 + cos4x 31/ cos3x.sìnx – cos4x.sinx = .
32/ (2sinx – 1)(2cos2x + 2sinx + 3) = 4sin2x – 1 33/ cosx.cos7x = cos3x.cos5x
34/ 35/ sinx + sin2x + sin3x = 0
36/ 37/ cos2x.sin4x + cos 2x = 2cosx(sinx + cosx) – 1
38/ 3 – tanx(tanx + 2sinx) + 6cosx = 0 39/ cos2x + cosx(2tan2x – 1) = 2
40/ 3cos4x – 8cos6x + 2cos2x + 3 = 0 41/ = 1
42/ 43/ cotx = tanx + 
44/ 45/ 
46/ tanx + cosx – cos2x = sinx(1 + tanx.tan 47/ sin(
48/ cos3x – sìnx = (cos2x - sin3x) 49/ 2cos2x - sin2x + sinx – cosx = 0
50/ sin3x + cos2x = 1 + sinx.cos2x 51/ 1 + sinx + cosx + sin2x + cos2x = 0
52/ cos2x + 5sinx + 2 = 0 53/ cos2x.sin2x + cos2x = 2(sinx + cosx)cosx – 1
54/ 8.sin2x + cosx = .sinx + cosx 55/ 3cos2x + 4cos3x – cos3x = 0
56/ 1 + cosx – cos2x = sinx + sin2x 57/ sin4x.sin2x + sin9x.sin3x = cos2x
58/ 59/ 
60/ 61/ 
62/ 2sin22x + sin7x – 1 = sinx 63/ 
64/ cotx + sinx 65/ cos3x + cos2x – cosx – 1 = 0