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Show that tan 3x tan 2x tan x = tan 3x -...

Show that `tan 3x tan 2x tan x = tan 3x - tan 2x - tan x`.

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`3x = 2x + x`
`tan 3x = tan(2x+x)`
`tan 3x = (tan 2x + tan x)/(1- tan2x*tanx)`
`tan3x (1- tan2x*tanx) = tan2x + tanx)`
`tan3x - tan3x*tan2x*tanx = tan2x + tanx`
`tan3x - tan2x - tanx = tan3x tan2x tanx`
hence proved
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