Chuyªn ®Ò :ph¬ng tr×nh lîng gi¸c
1/ sin4+cos4=1-2sinx 2/ cos3x-sin3x=cos2x-sin2x 3/ cos3x+ sin3x= cos2x 4/ vô nghiệm 5/cos6x-sin6x=cos22x 6/sin4x+cos4x= ................
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