Trigonometric Ratios For 30°, 45° And 60°, Trig Ratios For Multiples Of 30°, 45° And 60° In this tutorial I show you how you can calculate the exact values of sin, cos and tan of 30°, 45° and 60° and their multiples, without a calculator by memorising some basic triangles as seen in the video.
Exact Trigonometric values using Fingers! In this tutorial, we can find the exact values of the trigonometry of basic angles (0, 30, 45, 60 and 90 degrees) simply using fingers. Learn this in less than 10 min.
Trig graphs. Here I show you how the graphs of sin θ and cos θ can be thought of as projections of the unit circle and also how to draw the graph of tan θ. I also look at some of their properties.
The start of transformations
Trig graphs. Combining all, example 2
Amplitude, period and frequency. Tutorial 1
Trigonometry Identities
The first two trig identities. They are very important and should be learnt. Generally you are not asked to prove them but just use them. They form the basis for many more other identities. In this video I explain how they are proved though.
Trig Identities 1. Proving trig identities example 1. Example 2, Example 3
Simplifying an expression using double angle formula
Solving Trig equations
Using the quadrant method
This link takes you to a set of 7 videos using the CAST or quadrant method. Video tutorial
Solving normal equations graphically
Example 3 - example of change the range or don't
Example 4 - why I change the range
Solving quadratic trig equations
Solving equations with identities