FunctionMedium
Question
Which of the following is an into function -
Options
A.f : [0, π] → [-1, 1], f (x) = sin x
B.f : [0, π] → [-1, 1], f(x) = cos x
C.f : R → R, f(x) = ex
D.f : Q → Q, f (x) = x3
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