Trigonometrik formulalar
Avval o‘zingiz yeching, keyin javobni tekshiring.
1
sin 80° cos 20° - cos 80° sin 20° ni hisoblang.
sqrt(3)/2
2
tg α = 2 bo‘lsa, tg 2α ni toping.
-4/3
3
sin 300° · cos 330° ni hisoblang.
-3/4
4
(sin 47° + sin 13°)/cos 17° ni hisoblang.
1
5
(1 - cos 2α)/(2 sin α) ni soddalashtiring.
sin α