1) 24570
2) 273
1) 15840
2) 198
Arcctg(-11) = <span>- 0.0906598872
</span>arcctg(-4,6) = <span>- 0,214060684
</span>arcctg(143) = <span>24.0397953
</span>arcctg(143), arcctg(-4,6), arcctg(-11)
4х² + 9х = 0
х(4х+9) = 0
х = 0; х = -9/4
Ответ:(-2½; 0)
1)cos20sin100 (+)
2)tg500cos120 (+)
3)sin(-50)ctg200(-)
4)ctg(-60)tg150(+)
5)sin(-70)tg(-50) (+)
<span>6)cos(-95)tg(-170) (+)
</span>