Page 133 - Bangladesh_classwiz_BOOK2018_rev_Neat

GwU †ÿÎd‡ji msLvMZ Avmbœ gvb (Avi ZvB wKQz dvsk‡bi †hvMRxKiY Ki‡Z K¨vjKz‡jUi †ek mgq ‡bq)
jÿYxq†h mvaviY exRMvwYwZK dvsk‡bi wbw`©ó †hvM‡Ri gvb †ei Kivi Rb¨ calculator wU‡K Angle unit,

degree mode G ivL‡Z nq Ab¨w`‡K w·KvYwgwZK dvsk‡bi wbw`©ó †hvM‡Ri gvb †ei Kivi Rb¨ K¨vjKz‡jU‡ii
Angle unit, radian mode G ivL‡Z n‡e|

D`vniYgvjv

2 − 4
1.
→ 0 2

mgvavb- Calulate mode G cÖ_‡g Angle unit radian G wb‡Z n‡e| †h‡nZz → 0 ZvB Gi gvb wn‡m‡e
Lye †QvU GKwU gvb †hgb . 0001 J †P‡c †g‡gvwi‡Z msiÿY K‡i ivwkwU wb‡Pi wØZxq w¯Œ‡bi g‡Zv
K¨vjKz‡jU‡i cÖ‡ek Kiv‡Z n‡e| Gici = Pvc‡j Z…Zxq w¯Œ‡bi g‡Zv djvdj cÖ`wk©Z n‡e|

(Key log- qw22.0001J[Cak2[)pk4
[)$[d=)

2
2. = 3 + 2 − 1 eµ‡iLvi (−1,0) we›`y‡Z ¯úk©‡Ki Xvj wbY©q Ki‡Z n‡e|

mgvavb- cÖ_‡g qy Y †P‡c K¨vjKz‡jU‡i AšÍiK Acv‡iUiwU cÖ‡ek Kiv‡Z n‡e| Gici wb‡Pi cÖ_g
w¯Œ‡bi g‡Zv K‡i dvskbwU K¨vjKz‡jUi cÖ‡ek Kwi‡q $ evU‡bi mvnv‡h¨ = −1 Gi gvb cÖ‡ek Kiv‡Z n‡e|

Gici = evUb Pvc‡j wØZxq w¯Œ‡bi g‡Zv Xvj ev Gi gvb cvIqv hv‡e|

(Key log- qy3[d+2[p1$p1=)

3. GKwU cv_iLÛ 98 wgUvi/‡m‡KÛ †e‡M Lvov Dc‡ii w`‡K wb‡ÿc Kiv n‡jv| mg‡q Gi MwZ mgxKiY
2
= 98 − 4.9 iƒ‡c cÖKvwkZ n‡j 10 ci Gi †eM KZ n‡e, Zv †ei Ki‡Z n‡e|

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