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Question

If y=11+xn−m+xp−m+11+xm−n+xp−n+11+xm−p+xn−p then dydx at x=emnp is equal to

A
emnp
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B
emn/p
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C
enp/m
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D
0
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Solution

The correct option is A 0
y=(11+(xnxm)+(xpxm))+(11+(xmxn)+(xpxn))+(11+(xmxp)+(xnxp))

=(xmxm+xn+xp)+(xnxn+xm+xp)+(xpxp+xm+xn)

=(xm+xn+xpxm+xn+xp)

=1
(dydx)=0

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