( X3 − 2 X + 1 ) ( SIN X + 3 COS X ) = X3 − 2 X + 1YX− > −AB

1) - DE THI MON TOAN THAM KHAO 1) - DE THI MON TOAN THAM KHAO
DE THI MON TOAN THAM KHAO

1) Giải phơng trình: ( x

3

− 2 x + 1 ) ( sin x + 3 cos x ) = x

3

− 2 x + 1

yx

−

> −

a

b