1.

k का मान ज्ञात कीजिए यदि फलन f बिन्दु `x = pi` पर संतत हो, जहाँ `f(x)={{:(kx+1",","यदि",x le pi),(cos x",","यदि",x gt pi):}`

Answer» (i) `f(pi)=k pi + 1`
(ii) R.H.L. `underset(x rarr pi^(+))(lim)f(x)=underset(h rarr 0)(lim)f(pi + h)`
`=underset(h rarr 0)(lim)cos(pi+h)," "[because x = pi + h gt pi]`
`= cos pi`
= - 1
(iii) L.H.L. `underset(x rarr pi^(-))(lim)f(x)=underset(h rarr 0)(lim)f(pi - h)`
`= underset(h rarr 0)(lim)k(pi - h)+1`
`underset(h rarr 0)(lim)(k pi - kh + 1)`
`= k pi + 1`
चूँकि फलन f(x) बिन्दु `x = pi` पर संतत है ।
`therefore" ""R.H.L. = L.H.L."=f(pi)`
`rArr" "k pi + 1 = -1`
`rArr" "k pi = -2`
`rArr" "k = -(2)/(pi)`


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