Which of the following functions are one-one and onto ? | Mathematics | SolveeIt | Solveeit

Today, August 18

Question

Which of the following functions are one-one and onto ?

A

$f:R\rightarrow R,f(x)=\sin\,x$

B

$f:R^+\rightarrow R,f(x)=2\sqrt x+1$

C

$f:[0,\pi]\rightarrow [-1,1],f(x)=x$

D

none of these

Answer

$f:[0,\pi]\rightarrow [-1,1],f(x)=x$

Explanation

Solution

Answer (c) $f:[0,\pi]\rightarrow [-1,1],f(x)=x$