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a
x+yxy
b
xy
c
xy
d
yx
answer is D.
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Detailed Solution
Given that, xmyn=(x+y)m+nTaking on both sides, =we getmlogx+nlogy=(m+n)log(x+y)On differentiating w.r.t. x, we getmx+nydydx=(m+n)(x+y)1+dydx⇒ dydxm+nx+y−ny=mx−m+nx+y⇒dydxmy+ny−nx−nyy(x+y)=mx+my−mx−nxx(x+y)∴dydx=yx