2013 Chongqing Question 9 Single-choice Differentiating 2013_省自主命题(重庆) 9.$4\cos 50^\circ - \tan 40^\circ =$ A. $\sqrt{2}$B. $\dfrac{\sqrt{2}+\sqrt{3}}{2}$C. $\sqrt{3}$D. $2\sqrt{2}-1$ Answer keyC ☆ SaveCan't do it, show the explanation查看原卷 →