FunctionEasy
Question
Which of the following function is onto ?
Options
A.f : R → R ; f(x) = 3x
B.f : R → R+ ; f(x) = e-x
C.f : [0, π / 2] → [−1, 1] ; f(x) = sin x
D.f : R → R : f (x) = cosh x
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