Which rectangular equation represents the same curve as the polar equation ?

MATHEMATICS · Single correct · AP · AP Precalculus · Trigonometric and Polar Functions · Trigonometric and Polar Functions

Problem

Which rectangular equation represents the same curve as the polar equation r=4cos⁡θr = 4\cos\theta? (a) x2+y2=16x^2 + y^2 = 16 (b) (x+2)2+y2=4(x+2)^2 + y^2 = 4 (c) (x−2)2+y2=4(x-2)^2 + y^2 = 4 (d) y=4xy = 4x

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