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

Toán Lớp 11: 1)tanx . tan3x = 1 2) sin ( 4x – π/3 ) – cos ( 2x + π/4 ) = 0 giải giúp em với

Toán Lớp 11: 1)tanx . tan3x = 1
2) sin ( 4x – π/3 ) – cos ( 2x + π/4 ) = 0
giải giúp em với

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

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