The **green curve** represents the trigonometric **curve** **y=cos x **and the **grey straight line** represents **The x-axis is from 0 to 2π (6.28) radian.**

There are four points of intersection including the point (0,1) . Sometimes students do not include (0,1) because they either didn’t see the intersection at the left corner or they **mistakenly believe** that when two graphs touch it is NOT an intersection.

Additional Math (amath) (A math) Group Tuition. Woodlands Choa Chu Kang, Yew Tee, Yishun and Sembawang.