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Question

If y=1−x+x22!−x33!+x44!..., then d2ydx2 is equal to

A
x
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B
x
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C
y
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D
y
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Solution

The correct option is C y
We have, y=1x+x22!x33!+x44!....
dydx=1+xx22!+x33!....
d2ydx2=1x+x22!x33!+...=y

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