Q. 435.0( 2 Votes )
Mark the correct alternative in each of the following:
If f : R → (–1, 1) is defined by
then f–1(x) equals
A. 
B. 
C. 
D. none of these
Answer :
Given that f : R → (–1, 1) is defined by
Here for mod function we will consider three cases, x = 0, x<0 and x>0.
For x< 0
⇒ y(1 + x2) = x2
⇒ x2 (1 – y) = y
Also, checking on x>0 and x = 0 we find that
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