trigonometry-proofs-involving-half-and-double-angles

I work through 5 examples of verifying trigonometric identities that involve half angle and double angle identities.

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

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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