В6=в4 умножить на q^2; в6= 1/3 умножить на q^2;q^2=18; b8= B6 умножить на q^2; в8= 6 умножить на 18= 108
cost = 3/4
cos(t/2) = ((1 + cost)/2)^(1/2) = ((1 + 3/4)/2)^(1/2) = (7/8)^(1/2) = (7^(1/2))/(2*(2^(1/2)))
sin(t/2) = (1 - cos^2(t/2))^(1/2) = (1 - 7/8)^(1/2) = 1/(8^(1/2)) = 1/(2*(2^(1/2)))
tg(t/2) = sin(t/2)/cos(t/2) = (1/(2*(2^(1/2))))/((7^(1/2))/(2*(2^(1/2)))) = 1/(7^(1/2))
ctg(t/2) = 1/tg(t/2) = 7^(1/2)
X-6<√10(x-6)
(x -6)²<10x - 60
x²-12x+36-10x+60<0
x²-22x+96<0
D1= 121-96=25
x1;2=11+-5
x1= 6
x2=16
Ответ: (6;16)
Умножать можно неравенства одного знака - так и дано.
<span> 7 < 5
5/7 < 1/5
5 < 1</span>