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a
(−∞,∞)
b
[0,1)
c
(−1,0]
d
(−1,1)
answer is C.
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Detailed Solution
f(x)=ex−e|x|ex+e|x|=0, x≥0ex−e−xex+e−x, x<0 Clearly, f(x) is identically zero if x≥0----(1)∵ x<0 e2x<1 or 00 and 1+y1−y<1 or (y+1)(y−1)<0 and 2y1−y<0 i.e., −11 or −1