1.

Find the range of `tan^(-1)((2x)/(1+x^2))`A. `[-(pi)/(4), (pi)/(4)]`B. `(-(pi)/(2), (pi)/(2))`C. `(-(pi)/(2), (pi)/(4)]`D. `[(pi)/(4), (pi)/(2)]`

Answer» Correct Answer - A
`1 + x^(2) ge 2 |x|`
or `(2|x|)/(1 + x^(2)) le 1`
or `-1 le (2x)/(1 + x^(2)) le 1`
`rArr tan^(-1) ((2x)/(1 + x^(2))) in [-(pi)/(4), (pi)/(4)]`


Discussion

No Comment Found