a) 2cos2x + 1 = 0
b) 2cos(3x - $\frac{\pi }{3}$ ) - √3 = 0
c) √2 cos(3x + 30 độ ) -1= 0
d) 3cos2x + 1 =0
e) (3cos5x - 5 )(5cos3x - 3)=0
f) cos2 * sin3x=0
g) cos5x ( cos3x -1 )(5cos3x - 3)=0
Loga
Sinh Học lớp 12
