B
blue_cosy


giúp mikf` nhé!!!
4(cox 4x+sin 4x)+ cox 4x + sin 2x =0
:khi (162)::khi (162)::khi (162):
4(cox 4x+sin 4x)+ cox 4x + sin 2x =0
:khi (162)::khi (162)::khi (162):
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