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Differentials

5. Applications of Derivatives / Differentials / Problem 5

Problem 5

Write the differential of the surface area of a cone with a slant height $l$ , when the slant height changes from $l$ to $l + d l$ .

A

$d A = π l d l$

B

$d A = π r l d l$

C

$dA=\pi r\,dl$

D

$d A equals 2 pi r d l$

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