In this tutorial I show you how you can calculate the exact values of sin, cos and tan of 30°, 45° and 60° without a calculator by memorising some basic triangles as seen in the video.

30°, 45° and 60° Trig ratios

Simple way to learn the trig. ratios for 30, 60 and 45 degrees : ExamSolutions Maths Revision - youtube Video