MCQ
વિધેય $f(x) = - 1 + \frac{2}{{{2^x}^2 + 1}}$ ની મહત્તમ કિમત ........... થાય
- A$1$
- B$3/2$
- C$2/3$
- D$0$
Clearly $f(x)$ in an even function and $f(x)$ is greatest
when $\frac{2}{2^{x^{2}}+1}$ is greatest.
(given)
Also, $\frac{2}{2^{x^{2}}+1}$ is greatest when $2^{x^{2}}+1$ is least,
which occurs when $x=0.$
Hence greatest value is $f(0)=0.$
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$R = \{ (A,B) \in M \times M$ : $AB = BA\} ,$ હોય તો $R$ એ...........