Toán Lớp 11: giải giúp em với mn
1) sin ( 3x + 1 ) = sin ( x- 2 )
2 ) cos3x = sin2x
3) sin ( x – 120° ) + cos2x = 0
4) cos ( 2x + π/3 ) + cos ( x – π/3 ) = 0
5) sin3x + sin ( π/4 – x/2 ) = 0
6) tan ( 2x + 1 ) + cotx = 0
7) cot^2x = 1
8) sin^2x = 1/2
9) | cosx | = 1/2
10 ) sin^2 ( x – π/4 ) = cos^2x
Comments ( 1 )