TuyÓn tËp Ph¬ng tr×nh lîng gi¸c trong ®Ò thi §H-C§ (2002-2010) A02: T×m n o thuéc (0;2π ) cña PT: 5 3 +   + = +  ÷  +  cos3x sin3x sinx cos2x 1 2sin2x B02: GPT: 2 2 2 2 sin 3x cos 4x sin 5x cos 6x. − = − D02: T×m n o thuéc [0;14] cña PT: cos3 4cos2 3cos 4 0.x x x − + − = A03: GPT: cos2x 1 2 cot x 1 sin x sin 2x. 1 tan x 2 − = + − + B03: GPT: 2 cot x tan x 4 sin 2x . sin 2x − + = D03: GPT x x 2 2 2 sin tan x cos 0. 2 2 4 π   − − =  ÷   A : 2004 Tam giác ABC không tù và ( ) cos 2 2 2 cos cos 3x B C+ + = . Tính các góc của tam giác B04: GPT ( ) 2 5 sin x 2 3 1 sin x tan x.− = − D04: GPT ( ) ( ) 2cos x 1 2sin x cos x sin 2x sin x.− + = − A-05: GPT: cos 2 3x.cos2x-cos 2 x = 0 B-05: GPT 1 sin x cos x sin 2x cos2x 0+ + + + = D-05: GPT: 3 4 4 cos x sin x cos x sin 3x 0 4 4 2 π π     + + − − − =  ÷  ÷     A-06: GPT: ( ) 6 6 2 sin cos sin cos 0 2 2sin x x x x x + − = − B-06: GPT: cot sin 1 tan tan 4 2 x x x x   + + =  ÷   D-06: GPT: cos3x+cos2x-cosx-1=0 2 2 A07: GPT: (1 sin ) cos (1 cos ) sin 1 sin 2 2 B07: GPT: 2sin 2 sin 7 1 sin 2 D07: GPT: sin cos 3cos 2 2 2 x x x x x x x x x x x + + + = + + − =   + + =  ÷   A-2008: 1 1 7 4sin 3 sin 4 sin 2 x x x π π   + = −  ÷     −  ÷   B-2008: 3 3 2 2 sin 3 cos sin cos 3 sin .cosx x x x x x− = − 3. D-2008: ( ) 2sin 1 cos 2 sin 2 1 2cosx x x x+ + = + A-09: ( ) 1 2s os (1 2sin )(1 inx ins x) 3 c x x − = + − B-09: 3 sinx cos .sin 2 os3 2( os4 si3 n )x x x cc x x+ + = + D- 09 os5 2sin3x cos3 2 s inx 0x xc − − = CD 09 : 2 (1 2sinx) cos 1 sinx cosx x+ = + + A- 2010: (1 s inx os2 ) sin( ) 1 4 cos 1 t anx 2 c x x x π + + + = + B- 2010: (sin 2x + cos 2x) cosx + 2cos2x - sin x = 0 D- 2010: sin 2 cos 2 3sin cos 1 0x x x x − + − − = CĐ 2010: 5 3 4 cos os 2(8sin 1) cos 5 2 2 x x c x x + − = . TuyÓn tËp Ph¬ng tr×nh lîng gi¸c trong ®Ò thi §H-C§ (2002-2010) A02: T×m n o thuéc (0;2π ) cña PT: 5 3 +   + = +  ÷  +  cos3x sin3x sinx