1.

दर्शाइये कि फलन `f(x) = 2x - |x|` बिन्दु x = 0 पर संतत है ।

Answer» यहाँ `f(x) = 2x - |x|, a = 0`
(i) `f(0) = 2 xx 0-|0|=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)2(0+h)-|0+h|`
`=underset(h rarr 0)(lim)2h-|h|`
`=0 - 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)2(0-h)-|0-h|`
`=underset(h rarr 0)(lim)-2h-|h|," "[because |-x|=|x|]`
`=0 - 0 = 0`
`therefore" "underset(x rarr 0^(+))(lim)f(x)=underset(x rarr 0^(-))(lim)f(x)=f(0)`
अत: f(x) बिन्दु x = 0 पर संतत है ।


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