Chuyªn ®Ò :ph¬ng tr×nh lîng gi¸c
1/ a/1+tanx=2sinx + b/ sin x+cosx=- 2/ sin3x+cos3x=2sinxcosx+sin x+cosx 3/ 1- sin3x+cos3x= sin2x 4/ 2sinx+cotx=2 sin2x+1 5/sin2x(sin x+cosx)=2 ................
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