2008 Sichuan Question 3 Single-choice Differentiating 2008_退役省自主命题 (2008·理) 3. (5分) (2008•四川) (tanx+cotx)$cos2x=$( ) A. tanxB. sinxC. cosxD. cotx Answer keyD ☆ SaveCan't do it, show the explanation查看原卷 →