InterviewSolution
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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):}` |
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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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