write tan10x in terms of tan5x (?!)

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April 13th 2008, 06:28 PM
blair_alane

write 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! :(
April 13th 2008, 07:30 PM
o_O

Do you know the double angle formula for $\tan (2\theta )$ :

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

Here, imagine $\theta = 5x$

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