cos6xcos5x+sin6xsin5x=-1 cos(6x-5x)=-1 cosx=-1 x=pi+2pin
(3-5i)²=3²-30i+5²i²=9-30i-25=-16 -308
(5+3i)³=5³+3*5²*3i+3*5*3²i²+3³i³=125+225i-135-9i=-10+216i
-36(6х+1)=9(4-2х)
-216х-36=36-18х
-196х=72
х=-2,75
B1=b2*q(в степени n-1)
b1=4*(-0.5)=-2
S6=b1*(1-q^n-1)/1-q
S6=-2*(1-(-0.5)^5)/1-(-0.5)
Посчитайте и все
1) x=√0,09 x=0.3
2) x=√92 x=√4×23 x=2√23