March 22, 2011

I have attached today's first lesson on solving Trig Identities. 

Identities Lesson 1

Remember to always pick one side and "work it out" to look like the other side.  Many of these solutions come out quite easily if you express everything on the most complex side in terms of sine and cosine only.  There can be various ways to arrive at the same solution so don't despair if your neighbor has completed the solution in a different way.

Example 1: 

Prove that

sin y + sin y cot² y = csc y :         SOLUTION BELOW

Example 2: 

Prove that

sin x cos x tan x = 1 − cos² x:    SOLUTION BELOW

Example 3:

Prove that

     SOLUTION BELOW

The handout sheet of Identities is due to hand in on Friday March 25th, 2011.  Remember you only need to complete the ODD number questions.   Please hand in at the end of class.