AP EAMCET Engineering 2012 Solved Paper

Section: Mathematics

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Question : 109 of 160

Marks: +1, -0

If u=f(r), where r2=x2+y2, then (

𝜕2u

𝜕x2

+

𝜕2u

𝜕y2

) is equal to

f"(r)
f"(r)+f′(r)
f"(r)+
1
r
f′(r)
f"(r)+rf′(r)

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