## Effective ways to Remember Special Angle Values in Trigonometry

Under the O-level additional math syllabus, students are expected to know the values of several trigonometry special angles (Such as Sin30, Cos 45 and Tan 60 etc). The standard chart given in all textbooks and notes will be as follows: Method 1: How to remember? The chart below is an easier version to remember. Simply observe the nice pattern of sin(x) from left to right, and cos(x) from right to left. Lastly, obtain tan(x) using the identity tan(x) = sin(x)/cos(x) . Method