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Find the curvature of each of the functions defined by the parametric equations in Exercises 36–38.

x=acost,y=bsint

Short Answer

Expert verified

The curvature isaba2sin2t+b2cos2t32.

Step by step solution

01

Step 1. Given information.

The given equations are,

x=acost,y=bsint

02

Step 2. Curvature.

Curvature is given by,

k=T'(t)r'(t)r'(t)=a2sin2t+b2cos2tT(t)=r'(t)r'(t)T(t)=-asint,bcosta2sin2t+b2cos2tT'(t)=-ab2costa2sin2t+b2cos2t32,a2bsinta2sin2t+b2cos2t32T'(t)=a2b4cos2ta2sin2t+b2cos2t3+a4b2sin2ta2sin2t+b2cos2t3=a2b2b2cos2t+a2sin2ta2sin2t+b2cos2t3=aba2sin2t+b2cos2tk=T'(t)r'(t)=aba2sin2t+b2cos2ta2sin2t+b2cos2t=aba2sin2t+b2cos2t32

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