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Cocoa Programming for OS X: The Big Nerd Ranch Guide by Aaron Hillegass, Adam Preble, Nate Chandler

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Challenge: Vector Angle

Your Vector structure should be able to report its angle in radians. Add a read-only, computed property to it called angle.

The angle of a vector can be expressed in Swift as:

 ​ ​ ​ ​a​t​a​n​2​(​y​,​ ​x​)​

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