4
0
-2
-4
Correct answer is A
f(x)=12−x,x≠2
f(y)=12−y
x=12−y (Let x = f(y))
2x−xy=1⟹y=2x−1x
∴f−1(x)=2x−1x
f−1(−12)=2(−12)−1−12
= −2×−2=4
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