Problem with using Power-Reducing Trigonometric identities

[greerhead]

1. The problem statement, all variables and given/known data
Tan^3Theta


2. Relevant equations

Tan^2Theta=1-cos2Theta/1+cosTheta

3. The attempt at a solution
Attached

[rock.freak667]

What are you trying to reduce it to?

[greerhead]

until there are no terms with a power greater than 1

[rock.freak667]

until there are no terms with a power greater than 1

Then you can just replace tan by sin/cos in your third line and multiply out and you will have no term whose power is greater than one.

[greerhead]

Thanks! I was over complicating it, like usual.