Three Phase Polar Math question

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SaltySteve PE

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I can't for the life of me figure out how to get 7480<-21.2. It's a step in an example circuit analysis problem from School of PE.

Polar math is kicking my butt at the moment. Cant anyone help me understand how to work this.

-Steve  

 
At least I'm not crazy. I got that 784.7<42.9 as well. Here's the whole example. My only issue is that they did the example this was as well as with another method and came up to the same 13KV

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