Chuyªn ®Ò :ph¬ng tr×nh lîng gi¸c
9/ cos6x+sin6x=cos4x 10/ sinx+sin2x+sin3x+sin4x= cosx+cos2x+cos3x+cos4x . 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 ................
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