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how can 1-tan(2x)tan^2(x)-2tan(x)+tan(2x) become 1-tan(2x)(tan^2x-1)-2tan(x)?

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how can 1-tan(2x)tan^2(x)-2tan(x)+tan(2x) become 1-tan(2x)(tan^2x-1)-2tan(x)?
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Reorder:

1 - tan(2x)·tan²(x) + tan(2x) - 2·tan(x)

Then factorize the -tan(2x)
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