... ủoự ()* tgx 1 2+= tgx 1 4+= tgx 3 tg vụựi22 == <<,xkk =+ Baứi 144 : Gia i phửụng trỡnh ()()11 cos x cos x cos2x sin 4x *2+ = ()()* 1 cosx cosx cos2x sin2xcos2x ... ===xh,h4sin 2x 1 sin 2x 1hay haycosx0( sin2x0) cosx1( sinx0 sin2x0) =+ xh,h4 Baứi 145 : Gia i phửụng trỡnh ( ) ( ) ( )33sin x 1 cot gx cos x 1 tgx 2 sin x cos x *++ += ()33sinx ... trình 333 3sinx cosx sinxcotgx cosxtgx 2sin2x++ + = ⇔=π⇔= ∈sin 2x 0kx,k2 Baøi 151 : Gia i phuông trình ( )44sin x cos x sin x cos x *−=+ ()()()2222* sin x cos x sin x cos x...