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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)]` |
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