Chuyªn ®Ò :ph¬ng tr×nh lîng gi¸c
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. 5/ 3sinx+2cosx=2+3tanx 6/ sin2x+cos2x+cosx=0 . 7/ 2sin2x-cos2x=7sinx+2cosx-4 8/ 9/ 2cos2x-8cosx+7= 10/ cos8x+sin8x=2(cos10x+sin10x)+cos2x ................
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