⇒ (1)
⇒ (2)
![\frac{tan(5x)+tan(4x)-tan(5x)[1-tan(5x)tan(4x)]}{1-tan(5x)tan(4x)+tan(5x)[tan(5x)+tan(4x)]}](/tpl/images/0198/1682/88f62.png)
![\frac{tan(4x)+tan^{2}(5x)tan(4x)}{[1+tan^{2}(5x)]}](/tpl/images/0198/1682/eca1e.png)
![\frac{tan(4x)[1+tan^{2}(5x)]}{[1+tan^{2}(5x)]}](/tpl/images/0198/1682/2536f.png)
Simplify tan9x-tan5x / 1+tan9xtan5x
(show work)...
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