1.

Range of `f(x) =1/(1-2cosx)` isA. `[(1)/(3),1]`B. `[-1,(1)/(3)]`C. `(-oo,-1)uu[(1)/(3),oo)`D. `[-(1)/(3),1]`

Answer» Correct Answer - B
We known that , `-1le-cosxle1`
`rArr-2le-2cosxle2`
`rArr 1-2le1-2cos le 1+2`
`rArr -1le1-2cos xle3`
`rArr-1le(1)/(1-2cosx)le(1)/(3)`
`rArr-1lef(x)le(1)/(3)`
`:.` Range of `f=[-1,(1)/(3)]`


Discussion

No Comment Found