We are supposed to:

"write tan10x in terms of tan5x."

I'm stumped! I don't remember learning this!

Please help me! :(

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- Apr 13th 2008, 06:28 PMblair_alanewrite tan10x in terms of tan5x (?!)
We are supposed to:

"write tan10x in terms of tan5x."

I'm stumped! I don't remember learning this!

Please help me! :( - Apr 13th 2008, 07:30 PMo_O
Do you know the double angle formula for $\displaystyle \tan (2\theta )$:

$\displaystyle \tan (2\theta) = \frac{2 \tan \theta}{1 - \tan^{2} \theta}$

Here, imagine $\displaystyle \theta = 5x$