圆与三角函数知识都是初中数学知识的重点,也是难点,若将这两个知识点结合起来考查,同学们将会感到难度更大.为了帮助同学们掌握此类综合题的解法,下面从2014年各地的中考题中选析几例,希望对提高同学们的解题能力、提振考试信心能够有所帮助.例1(黄石)如图1,⊙O的直径CO=10 cm,AB是⊙O的弦,AB⊥CD,垂足为P,AB=8 cm,则sin∠OAP Circular and trigonometric knowledge are the key and difficult points of junior middle school mathematics knowledge. If these two knowledge points are combined and examined, students will find it more difficult. In order to help students master the solution of such comprehensive questions, the following In the examination questions of various places in 2014, several cases were selected and analyzed, hoping to help students improve their problem-solving abilities and boost their confidence in the examination. Example 1 (Yellowstone) As shown in Fig. 1, the diameter of CO is 10 cm, and AB is ⊙O’s chord, AB⊥CD, pedestal is P, AB=8 cm, then sin∠OAP