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Q.

If  f(x+y+l,xy+l)=xy, then  f(x,y)=

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a

(x+y2+2)(xy2)

b

(x+y2)(xy22)

c

(x+y2)(xy2+2)

d

(x+y22)(xy2)

answer is D.

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Detailed Solution

f(x+y+l,xy+l)=xy

x+y+1=a

xy+1=b____________

x+1=a+b2

x=a+b21

x=a+b22

x+y+1=a

xy+1=b

y=ab2

Replacing  x with  x+y22

Replacing y with  xy2

f(x,y)=(x+y22)(xy2)

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If  f(x+y+l,x−y+l)=xy, then  f(x,y)=