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fstrujag6745
2 năm trước
Giải phương trình sau: a)cos3x + cos7x =1 + cos4x b)2cosx -1=0 c)sin2x . cos3x=sin5x . cos6x d)cosx - cos2x + cos3x=1/2 e)sinx + sin2x + sin3x=cosx + cos2x + cos3x 💜Giải giúp mình với ạ:((((
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