Page 112 - Bangladesh_classwiz_BOOK2018_rev_Neat
P. 112
Abykxjbx-9
gvb wbY©q Ki-
2
1−cos 60° 2
1| + sec 60°
2
1+cos 60°
2
1−cot 60°
2|
2
1+cot 60°
2
3| 45° . sin 60° . 30° . 60°
− √3−1
4| mgvavb Ki- =
+ √3+1
1
2
2
2
2
©
5| gvb wbYq Ki- 3 cot 60° + 30° + 5 sin 45° − 4 cos 60°
4
6| gvb wbY©q Ki- (a) 30° (b) cos 2
1
7| = n‡j Gi gvb ‡Kv‡bvwU?
2
8| 34.458° †K wWwMÖ, wgwbU I †m‡K‡Û iƒcvšÍi Ki|
9| 15° Gi mwVK gvb KZ?
10| 31° †K †iwWqv‡b cÖKvk Ki‡j Kx n‡e?
11| (6, 5) we›`ywUi †cvjvi AvK…wZ Kxiƒc n‡e?
12| (4,240°) we›`ywU‡K Kv‡Z©mxq ¯’vbv‡¼ iƒcvšÍi Ki‡Z n‡e? GwU ‡Kv‡bv PZzf©v‡M Aew¯’Z?
13| ABC wÎfy‡Ri = 17.2 , = 35° Ges = 82°. Gi ˆ`N¨© †ei Ki|
14| mgvavb Ki- 4 cos + 6 = 7, 0° < < 360°.
15| mgvavb Ki- 5 sin − 2 = 1.
16| 18 wgUvi j¤^v GKwU gB GKwU †`Iqv‡ji Qv` eivei †Vm w`‡q f‚wgi m‡½ 45° †KvY Drcbœ K‡i|
†`IqvjwUi D”PZv wbY©q Ki|
17| GKwU wgbv‡ii cv`‡`k †_‡K wKQz `~‡i GKwU ¯’v‡b wgbviwUi kx‡l©i DbœwZ †KvY 30° Ges wgbviwUi D”PZv
26 wgUvi n‡j, wgbvi †_‡K H ¯’vbwUi `~iZ¡ wbYq Ki|
©
18| 64 wgUvi j¤^v GKwU LyuwU †f‡½ wM‡q m¤ú~Y wew”Qbœ bv n‡q f‚wgi mv‡_ 60° †KvY Drcbœ K‡i| LyuwUwUi fvOv
©
As‡ki ˆ`N¨© wbYq Ki|
©
19| 0 †_‡K 180 wWwMÖi g‡a¨ dvsk‡bi gv‡bi ZvwjKv ˆZwi Ki‡Z n‡e| gv‡bi ZvwjKv e¨envi K‡i
cos Ges cos (180° − ) Kxfv‡e m¤úwK©Z Zv e¨L¨v Ki|
20| wkÿv_©©xiv Zv‡`i †_‡K 50 `~i‡Z¡i GKwU Mv‡Qi D”PZv gvc‡Z Pvq| Zviv †`L‡jv, MvQwUi DbœwZ †KvY
17°| MvQwUi AvbygvwbK D”PZv KZ?
107
