1.

फलन `f(x) = |x|` के सांतत्य की विवेचना x = 0 पर कीजिए ।

Answer» यहाँ `f(x)=|x|, a = 0`.
(i) `f(0)=|0|=0`
(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|`
`=underset(h rarr 0)(lim)|h|`
`=|0|=0`
(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|`
`=underset(h rarr 0)(lim)|-h|`
`= |0|`
= 0
`therefore" "underset(x rarr 0^(+))(lim)f(x)=underset(x rarr 0^(-))(lim)f(x)=f(0)`
अत: `f(x) = |x|` बिन्दु x = 0 पर संतत है ।


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