1.

दर्शाइये कि फलन `f(x)={{:((|x|)/(x)",",x ne 0),(1",",x = 0):} x = 0` पर असंतत है ।

Answer» (i) `f(0) = 1`
(ii) R.H.L. `=underset(x rarr 0^(+))(lim)f(x)=underset(h rarr 0)(lim)f(0+h)`
`=underset(h rarr 0)(lim)(|0+h|)/((0+h))`
`=underset(h rarr 0)(lim)(|h|)/(h)`
`=underset(h rarr 0)(lim)(h)/(h)=1," "[because |x|=x]`
(iii) L.H.L. `=underset(x rarr 0^(-))(lim)f(x)=underset(h rarr 0)(lim)f(0-h)`
`=underset(h rarr 0)(lim)(|0-h|)/((0-h))`
`=underset(h rarr 0)(lim)(|-h|)/(-h)`
`=underset(h rarr 0)(lim)(h)/(-h)," "[because |-x|=x]`
= -1.
`therefore" "underset(x rarr 0^(+))(lim)f(x) ne underset(x rarr 0^(-))(lim)f(x)`
अत: फलन f(x) बिन्दु x = 0 पर असंतत है ।


Discussion

No Comment Found

Related InterviewSolutions