Chuyªn ®Ò :ph¬ng tr×nh lîng gi¸c
22/ 1+tanx=sinx+cosx 23/ (1-tanx)(1+sin2x)=1+tanx . 24/ 2= 25/ 2tanx+cotx= 26/ cotx-tanx=cosx+sinx 27/ 9sinx+6cosx-3sin2x+cos2x=8 . DANG 8 : Phương trình LG phải thực hiện công thúc nhân đôi, hạ bậc . cos2x= cos2x- sin2x =2cos2x-1=1-2sin2x. sin2x=2sinxcosx ................
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