2008 Sichuan Question 3 Single-choice Differentiating 2008_省自主命题(四川) 3.(5 分)(2008•四川)$(\tan x+\cot x)\cos^2 x = (\quad)$ A. $\tan x$B. $\sin x$C. $\cos x$D. $\cot x$ Answer keyD ☆ SaveCan't do it, show the explanation查看原卷 →