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Ladies and Gents,

Was working out this practice problem in PPI Camara.  Problem #98.

I got 100degrees.

Looking through the solution I see that they put: (cos(180))=0...  well I got: cos(180)=-1

Thoughts?  Please, see references.

IMG_7137.jpgIMG_7138.jpgIMG_7139.jpg

 

AND GOOD LUCK TO ALL OF THOSE TAKING THE EXAM THIS FRIDAY!

Thanks,

Brip

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