... ủoự
()
* tgx 1 2+=
tgx 1 4+=
tgx 3 tg vụựi
22
== <<
,xkk
=+
Baứi 144 : Gia i phửụng trỡnh
()
()
1
1 cos x cos x cos2x sin 4x *
2
+ =
()
()
* 1 cosx cosx cos2x sin2xcos2x ... ===
xh,h
4
sin 2x 1 sin 2x 1
hay hay
cosx0( sin2x0) cosx1( sinx0 sin2x0)
=+ xh,h
4
Baứi 145
: Gia i phửụng trỡnh
(
)
(
)
(
)
33
sin x 1 cot gx cos x 1 tgx 2 sin x cos x *++ +=
(...
... ủoự
()
* tgx 1 2+=
tgx 1 4
+=
tgx 3 tg vụựi
22
== <<
,xkk
=+
Baứi 144 : Gia i phửụng trỡnh
()
()
1
1 cos x cos x cos2x sin 4x *
2
+ =
()
()
* 1 cosx cosx cos2x sin2xcos2x
... ===
xh,h
4
sin 2x 1 sin 2x 1
hay hay
cosx0( sin2x0) cosx1( sinx0 sin2x0)
=+ xh,h
4
Baứi 145
: Gia i phửụng trỡnh
( ) ( ) ( )
33
sin x 1 cot gx cos x 1 tgx 2 sin x cos x *++ +=...