A) X = Π4+K2Π K ∈ Z A) 2SIN2X - 1 = 0 B) COS2X + 2 3SINX.COSX + 3SIN2X...

bài1: - TUYEN TAP DE THI LOP 11
Lớp 11 TUYEN TAP DE THI LOP 11

Bài1: a) x =

π

4

+

k

2

π

k

∈

Z

a) 2sin

2

x - 1 = 0

b) cos

2

x + 2

3

sinx.cosx + 3sin

2

x

b) x =

−

π

3

+

k

π

= 1