Page 108 - Bangladesh_classwiz_BOOK2018_rev_Neat

9.8 ¯’vbvsK e¨e¯’v

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wÎfzR msµvš MYbvmg~n QvovI w·KvYwgwZ ‡Kv‡bv mgZ‡j we›`yi ¯’vcb msµvš MYbvi †ÿ‡Î e¨envi Kiv nq|
eûj cÖPwjZ GKwU c×wZ n‡”Q AvqZvKvi ¯’vbv¼ e¨e¯’v| GwU Kv‡Z©mxq ¯’vbv¼ e¨e¯’v bv‡gI cwiwPZ|

GB e¨e¯’vq GKwU we›`y I Aÿ †_‡K KZUv `~‡i Zvi cwigvc Øviv we›`ywUi ¯’vbv¼ wbw`©ó nq| ‡Kv‡bv we›`yi
¯’vbv¼ (3, 4) Øviv †evSv hvq we›`ywU Aÿ †_‡K 3 GKK Wv‡b I Aÿ †_‡K 4 GKK Dc‡i Av‡Q|

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Av‡iKwU c×wZ n‡jv †cvjvi ¯’vbvsK e¨e¯’v| GB c×wZ‡Z GKwU we›`yi ¯’vbv¼ wbY‡qi Rb¨ we›`ywU g~j we›`y †_‡K
mivmwi KZ `~‡i Aew¯’Z Ges Aÿ †_‡K Nwoi KuvUvi wecixZ w`‡K †Kv‡Yi cwigvY KZ? Zvi gva¨‡g wbY©q Kiv
nq| †cvjvi ¯’vbvsK e¨e¯’vq ( , ) Øviv we›`y‡K Dc¯’vcb Kiv nq| ClassWiz G Lye mn‡RB GB `yB c×wZi

g‡a¨ iƒcvšÍi m¤¢e| GRb¨ q+ (Pol) Ges qp (Rec) evUb¸‡jv e¨envi Ki‡Z nq| wb‡Pi w¯Œ‡b
Kxfv‡e Kv‡Z©mxq ¯’vbvsK e¨e¯’v †_‡K ‡cvjvi ¯’vbv¼ e¨e¯’vq iƒcvšÍi Kiv hvq Zv †`Lv‡bv n‡jv-

q) evUb e¨envi K‡i Kgv (,) wPý †`Iqv n‡q‡Q|
‡h‡nZz msL¨v¸‡jv A‡bK eo I w¯Œ‡b m¤ú~Y© †`Lv hvq bv †mRb¨ $ Kx e¨envi K‡i m¤ú~Y© djvdj †`L‡Z n‡e|

G‡ÿ‡Î (3, 5) we›`ywU †cvjvi ¯’vbv¼ e¨e¯’vq (5.831, 59.036) Øviv Dc¯’vcb Kiv nq| hv Øviv †evSv hvq †h,
we›`ywU g~jwe›`y †_‡K 5.831 `~i‡Z¡ Ges Aÿ‡iLv †_‡K Nwoi KuvUvi wecixZ w`‡K 59.036° †Kv‡Y Aew¯’Z|
Abyiƒcfv‡e, wb‡Pi w¯Œ‡b †cvjvi ¯’vbv¼ e¨e¯’v †_‡K GKwU we›`yi AvqZvKvi e¨e¯’vq iƒcvšÍi †`Lv‡bv n‡jv-

myZivs (2, 45) we›`ywU Kv‡Z©mxq ¯’vbv¼ e¨e¯’vq (1.4142,1.4142) Øviv Dc¯’vcb Kiv hvq|

D`vniYgvjv

1. tan − −1 Gi gvb wbY©q Ki‡Z n‡e|
+1 tan

mgvavb- GRb¨ cÖ_‡g ClassWiz K¨vjKz‡jU‡ii †ggwi‡Z 45 gvbwU J e¨envi K‡i msiÿY Ki‡Z n‡e|
Gici wb‡Pi cÖ_g w¯Œ‡bi g‡Zv K‡i w·KvYwgwZK ivwkwU cÖ‡ek Kwi‡q = evUb Pvc‡j wb‡Pi wØZxq ¯¿x‡bi g‡Zv
djvdj cvIqv hv‡e|

(Key log -45JzlQz)a1akQz)$+1$p
aa1$kQz)$p1$lQz))
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