## Contents

**Fallacies about the Derivative of the Trigonometric Sine Function**by*TOH Tin Lam, TAY Eng Guan and TONG Cherng Luen*(pp. 1-10)**Visualising Infinite Sums as a Study in Shifts of Attention**by*John MASON*(pp. 11-32)**A Listing Approach for Counting Problems**by*NG Wai Kuen and LEONG Yew Hoong*(pp. 33-46)**A Tri-Lens Approach for Unpacking Teachers’ Design of Instructional Materials**by*CHIN Sze Looi, CHOY Ban Heng and LEONG Yew Hoong*(pp. 47-62)**BOOK REVIEW – Big Ideas in Mathematics**. Reviewed by*Berinderjeet KAUR*(pp. 63-66)