FunctionHard
Question
Which of the following functions has its inverse-
Options
A.f : R → R , f(x) = ax
B.f : R → R , f(x) = |x| + |x − 1|
C.f : R0 → R+ , f(x) = |x|
D.f : [π, 2π][−1, 1], f(x) = cos x
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