Chuyªn ®Ò :ph¬ng tr×nh lîng gi¸c
1/a/ 3sin2x- sinxcosx+2cos2x cosx=2 b/ 4 sin2x+3sinxcosx-2cos2x=4 c/3 sin2x+5 cos2x-2cos2x-4sin2x=0 d/ 2 sin2x+6sinxcosx+2(1+ )cos2x-5-=0 2/ sinx- 4sin3x+cosx=0 2 cách +/ (tanx -1)(3tan2x+2tanx+1)=0 ................
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