O‘zbekistоn respublikаsi хаlq tа’limi vаzirligi huzuridagi respublikа tа’lim

12-BILET

1. 
   Ifodani soddalashtiring: .
   
2. 
   y=│3-x│ funksiya grafigini yasang.
   
3. 
   cosα=-0,8, bo‘lsa, tangensi va kotangensini aniqlang.
   
4. 
   Qavariq ko‘pburchak ta’rifini va uning xossalarini keltiring. Qavariq ko‘pburchak diagonallari soni haqidagi teoremani isbotlang.
   
5. 
   Teng yonli uchburchakning uchidagi burchagi 120^o ga, yon tomoni 3 ga teng. Shu uchburchakka tashqi chizilgan aylana radiusini toping.
   

13-BILET 1. ^320011997 1998 2000  9 ni hisoblang {an} arifmetik progressiyada a2+a9=20 bo‘lsa, S10 ni hisoblang. Agar ctg(^+ )=2 bo‘lsa, ctgα ni toping. 4 Uchburchak o‘rta chizig‘ining ta’rifini keltiring. Uchburchak o‘rta chizig‘i haqidagi teoremani isbotlang. Rombning katta diagonali 18 sm va bir burchagi 120^0 bo‘lsa, uning yuzini toping.