Sets, Relations & Functions · NDA previous year questions

2017 26 questions

1. Q1182017 · 23 Apr 2017

   The function $f:X\to Y$ defined by $f(x)=\cos x$, where $x\in X$, is one-one and onto if $X$ and $Y$ are respectively equal to

   1. A.$[0,\pi ]$ and $[-1,1]$
   2. B.$[-\frac{\pi }{2},\frac{\pi }{2}]$ and $[-1,1]$
   3. C.$[0,\pi ]$ and $(-1,1)$
   4. D.$[0,\pi ]$ and $[0,1]$
   Show answer

   Answer: A