In the Problem Set of Unit 4, in the part of surface Area, problem 4G-5 I don't understand why the limits of integration go from 0 to 2 when the integration is made by "dy" and in the y-axis the upper limit is 4.

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can i ask u abt math .im new student

Sure, I'll help with whatever I can :)

i cant know how to chat here.can i take ur facebook and ask u about some notes

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