Page 132 - Bangladesh_classwiz_BOOK2018_rev_Neat

G‡ÿ‡Î 6 × 4 = 24 †_‡K AšÍi‡Ki ‰ewkó¨ †evSv hvq| 6 Gi cwie‡Z© Ab¨ †h‡Kv‡bv aªæeK Ges 2 Gi cwie‡Z©
Ab¨ †h‡Kv‡bv we›`yi Rb¨ GwU mZ¨|

Abyiƒcfv‡e, `yBwU dvsk‡bi AšÍi‡Ki †hvMdj dvskb `yBwUi †hvMd‡ji AšÍi‡Ki mgvb| wb‡Pi w¯Œ‡b = 3
3
6
we›`y‡Z ( ) = 2 I ( ) = Gi Rb¨ GwU †`Lv‡bv n‡jv-

Í
myZivs wbe©vwPZ we›`y‡Z, dvskb `yBwUi Aši‡Ki †hvMdj, dvskb `yBwUi †hvMd‡ji AšÍi‡Ki mgvb
54 + 1458 = 1512

‡Kv‡bv mij‰iwLK dvsk‡bi AšÍi‡Ki gvb Lye mn‡RB Gi Xvj †_‡K Abygvb Kiv hvq| mij‰iwLK dvsk‡bi mKj
we›`y‡Z AšÍi‡Ki gvb mgvb nq, hv cÖK…Zc‡ÿ GKwU mij‡iLvi ˆewkó¨| AšÍiK n‡”Q mij †iLvwUi Xvj| D³
m¤úK©wU derivative wb‡`©kbv e¨envi K‡i wb‡P ch©‡eÿY Kiv n‡jv|

ClassWiz K¨vjKz‡jU‡i dvskb Ges AšÍi‡Ki wewfbœ ˆewkó¨ cixÿv Kiv †M‡jI mvaviY AšÍiK A_ev AšÍi‡Ki
‡Kv‡bv m~‡Îi cÖwZcv`b m¤¢e bq| wKš‘ m~‡Îi ev¯Íe cÖ‡qvM Ges ev¯Íe mgm¨v mgvav‡b AšÍiK e¨envi Kiv hvq|

12.4 †hvMRxKiY

AšÍixKi‡Yi g‡ZvB ClassWiz K¨vjKz‡jU‡ii gva¨‡g wbw`©ó †hvM‡Ri gvb †ei Kiv hvq| †mRb¨ y Kx e¨envi
Ki‡Z n‡e| ev¯Íe Rxe‡b †hvMRxKi‡Yi A‡bK e¨envi i‡q‡Q| †hvMRxKi‡Yi gva¨‡g ‡Kv‡bv dvsk‡bi †jLwP‡Îi
wbw`©ó A‡ji †ÿÎdj †ei Kiv hvq|
‡Kv‡bv †hvM‡Ri gvb msL¨vMZfv‡e †ei Kivi Rb¨ cÖ_‡g y Kx Pvc‡Z n‡e Gici ch©vµ‡g dvskb I !,$
2
Kx e¨envi K‡i mxgvi gvb cÖ‡ek Kiv‡Z n‡e| wb‡P ( ) = 3 − 4 + 5 Gi †jLwPÎ Gi wb‡Pi I A‡ÿi
2 2
Dc‡ii Ges = 0 I = 2 Øviv Ave× †ÿ‡Îi †ÿÎdj A_©vr ∫ 3 − 4 + 5 Gi gvb †ei Kivi
0
wZbwU avc †`Lv‡bv n‡jv-

Dc‡ii mxgvi gvb cÖ‡ek Kiv‡bvi ci = evUb Pvc‡j w¯Œ‡b djvdj cÖ`wk©Z n‡e|

127