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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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 $\displaystyle \theta = 5x$
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