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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 11: mọi ng chỉ em với : 1) sin3x = -1/2 2) cos2x = -√2/2 ( trừ căn 2 phần 2 ) 3) sin2x – sin2xcosx = 0 4) sin3x – cos2x = 0 5) tan4x . tan2

Toán Lớp 11: mọi ng chỉ em với :
1) sin3x = -1/2
2) cos2x = -√2/2 ( trừ căn 2 phần 2 )
3) sin2x – sin2xcosx = 0
4) sin3x – cos2x = 0
5) tan4x . tan2x = 1
6) 2cos ( x – π/6 ) + 1 = 0
7) tan ( 2x + π/3 ) + tan3x = 0
giải giúp em vote 5 sao luôn

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222-9+11+12:2*14+14 = ? ( )