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}(-\frac{1}{2}) = \frac{2(-\frac{1}{2}) - 1}{-\frac{1}{2}}
= -2 \times -2 = 4
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