Page 111 - Bangladesh_classwiz_BOOK2018_rev_Neat

evUb ‡P‡c [ †g‡gvwi‡Z GB gvb msiÿY Ki‡Z n‡e| Gici Z…Zxq w¯Œ‡bi g‡Zv tan UvBc K‡i = Pvc‡j

Gi gvb cvIqv hv‡e|

(Key log- 7(j[))d+3(k[))dQr4q

r45==J[=l[)=)

2
9. 2 sin + 3 cos = 0, Gi mgvavb Ki‡Z n‡e ‡hLv‡b 0 < < 2 .

mgvavb- cÖ_‡g Calculate mode- G mgxKiYwU‡K wb‡Pi cÖ_g w¯Œ‡bi g‡Zv UvBc Ki‡Z n‡e| qr Pvcvi
ci Gi gvb wn‡m‡e 0 †_‡K 2 Gi g‡a¨ †h‡Kv†bv gvb cÖ‡ek Kiv‡Z n‡e| Gici = evUb Pvc‡j Z…Zxq
w¯Œ‡bi g‡Zv djvdj cÖ`wk©Z n‡e|

(Key log- 2j[)+3k[)Qr0qr130==)

10. 2 + 1 = 2 Gi mgvavb Ki‡Z n‡e|

mgvavb- GB w·KvYwgwZK mgm¨vi Rb¨ AmsL¨ mgvavb cvIqv hv‡e| A_©vr  Gi AmsL¨ gvb cvIqv hv‡e| GB
ai‡bi mgm¨v mgvav‡bi Rb¨ SOLVE mode e¨envi Kiv myweavRbK| SOLVE mode e¨envi Ki‡j  Gi

GKvwaK gvb cvIqv hv‡e| cÖ_‡g mgxKiYwU‡K wb‡Pi cÖ_g w¯Œ‡bi g‡Zv K¨vjKz‡jU‡i cÖ‡ek Kwi‡q qr
Pvc‡Z n‡e| Gici cÖ_‡g Gi gvb 20 cÖ‡ek Kwi‡q = Pvc‡j wØZxq w¯Œ‡bi g‡Zv djvdj cvIqv hv‡e 0 |
Aek¨B 0° mgxKiYwUi GKwU mgvavb| Gici Gi AbywgZ gvb wn‡m‡e 120° cÖ‡ek Kiv‡j 120 Gi wbKUZg

mgvavb 180 cvIqv hv‡e| Gfv‡e 300 cÖ‡ek Kiv‡j 360 I 470 Gi Rb¨ 540 Ges Gfv‡e AviI gvb cÖ‡ek
Kiv‡Z _vK‡j Ab¨vb¨ mgvavY¸‡jvI cvIqv hv‡e|

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