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```        pls help me ,I couldnt solve these
q1: if y=ex+e^x+e^x+...........∞,then dy/dx equals
q2:if x=at2 and y=2at then (xy*d2y/dx2)  is equal to

sir as u asked i checked both the ques , both are from the course material and are correct
the ans for q1 is = y/(1-y) .
sir in q2 could u pls exp how the chain rule is applied in diff. second time
thank u```
6 years ago

piyush shukla
24 Points
```										let y=e^x+e^x+...........∞,
then y=ex+y
now diff
dy/dx=ex+y(1+ dy/dx)
dy/dx(1- ex+y)= ex+y
dy/dx=( ex+y)/( 1- ex+y)
dy/dx=y/(1-y)
```
6 years ago
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