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Question

If ey(x+1)=1, then d2ydx2 is equal to

A
y
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B
dydx
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C
y
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D
(dydx)2
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Solution

The correct option is D (dydx)2
Given ey(x+1)=1
or, ey=1(x+1)
or, y=log(1+x)
Now
dydx=1(1+x)
And
d2ydx2=1(1+x)2=(11+x)2=(dydx)2

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