effective capital gains tax rate

One can express the impact of deferred capital gain taxes using an effective capital gain tax rate that adjusts the capital gains tax rate tcg to reflect previously taxed dividends, income, or realized capital gains. The effective capital gains tax rate can be expressed as7

T* = tcg(1 – pipdpcg)/(1 – pitipdtdpcgtcg)

(Institute 241)

Institute, CFA. 2018 CFA Program Level III Volume 2 Behavioral Finance, Individual Investors, and Institutional Investors. CFA Institute, 07/2017. VitalBook file.

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As the paragraph, I don’t want to just remember the formula. I want to understand how do we come up with this T* = tcg(1 – pipdpcg)/(1 – pitipdtdpcgtcg). In the curriculum didn’t explain.

Thanks a lot

bumpppp