Using the fundemental identities and the Pythagorean Identities, I go over multiple examples of verifying trigonometric identities.

It is very important in proofs that you do not handle it like an equation moving terms and factors from side to side.

I was corrected that what I am trying to prove should not be within the body of the proof. This implies it has already been assumed to be true. So proofs should be shown like this example:

cos^2(x)(tan^2(x)+1)=1

Proof:

cos^2(x)(tan^2(x)+1)=cos^2(x)*sec^2(x)

=cos^2(x)(1/cos^2(x))

=1

Verifying Trigonometric Identities Part 2

https://www.youtube.com/watch?v=q8k-sS7qRts

Verifying Trigonometric Identities Part 3

https://www.youtube.com/watch?v=mAnw4ImaPK0

Check out http://www.ProfRobBob.com, there you will find my lessons organized by class/subject and then by topics within each class. Find free review test, useful notes and more at http://www.mathplane.com

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