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LM5155: some equation confusion in AN: How to design an Isolated Flyback using LM5155

Part Number: LM5155

Hi team, 

In AN: How to design an Isolated Flyback using LM5155 https://www.ti.com/lit/an/snva866/snva866.pdf?ts=1656662891761&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FLM5155%253FkeyMatch%253DLM5155%2526tisearch%253Dsearch-everything%2526usecase%253DGPN

In 3.3.2, the result of Equation 15 is not equal to its equation result.

In 3.6, the result of Equation 21 is not equal to its equation result.

Could you pls help to check it? Or anything misunderstanding?

Thanks 

Rayna