Chuyªn ®Ò :ph¬ng tr×nh lîng gi¸c
3/ 4cosx.cos2x +1=0 4/ 5/ Cho 3sin3x-3cos2x+4sinx-cos2x+2=0 (1) và cos2x+3cosx(sin2x-8sinx)=0 (2). Tìm n0 của (1) đồng thời là n0 của (2) ( nghiệm chung sinx=) 6/ sin3x+2cos2x-2=0 7/ a/ tanx+ -2 = 0 b /+tanx=7. c* / sin6x+cos4x=cos2x ................
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