What is the differential for the total surface area of a frustum of a cone with i as the slant hetght? A. dSA = «[(l + 2R)dR + (l + 2r)dr] B. dSA = [(l + 2R)dR + (I + 2r)dr + (R +r)dl] C. dSA = R[(R +r)dl + (I + 2r)dr + 2RDR] D. dSA = 2r[(l + 2r)dr + (R + r)dl] %3D

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