Chuyªn ®Ò :ph¬ng tr×nh lîng gi¸c
11/ cos8x+sin8x= 12/ (sinx+3)sin4-(sinx+3) sin2+1=0 . DANG 7 : Phương trình LG biến đổi về tích bằng 0 . 1/ cos2x- cos8x+ cos4x=1 2/sinx+2cosx+cos2x-2sinxcosx=0. 3/sin2x-cos2x=3sinx+cosx-2 4/sin3 x+2cosx-2+sin2 x=0 ................
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