Question: In Problems a to c, use the formula in Problem 69 to find the curvature k of the following: a. Circle: r = 4 cos

In Problems a to c, use the formula in Problem 69 to find the curvature k of the following:
In Problems a to c, use the formula in Problem

a. Circle: r = 4 cos θ
b. Cardioid: r = 1 + cos θ at θ = 0
c. r = θ at θ = 1

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