( 1 + SIN2X) COSX + ( 1 + COS2X)SINX = 1 + SIN2X2 2LOG X (2X  X 1) LOG (2 X X1) 4

1. - DE THI HAY
DE THI HAY

1.Giải phơng trình : ( 1 + sin

2

x) cosx + ( 1 + cos

2

x)sinx = 1 + sin2x

2

2

log

x

(2x  x 1) log (2

x

x1) 4.

2

1

1