Prove that all normal to the curve x=acos+atsint,y=asint-atcost.Are at a distance a from the origin

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter11: Topics From Analytic Geometry
Section11.4: Plane Curves And Parametric Equations
Problem 33E
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Prove that all normal to the curve x=acos+atsint,y=asint-atcost.Are at a distance a from the origin 

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