Chuyªn ®Ò :ph¬ng tr×nh lîng gi¸c
3/+2sinx=0 4/3cotx- tanx(3-8cos2x)=0 5/ 6/sin3x+cos3x+ sin3xcotx+cos3xtanx= 7/tan2xtan23 xtan24x= tan2x-tan23 x+tan4x 8/tanx+tan2x=-sin3xcos2x ................
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