Ctg(360+a<span>)=-ctga
</span>Tg(270<span>+a)=-ctga
</span>
X^{2} - 3 x - 10 - ( x^{2} + x - 12) = 0 x^{2} - 3 x - 10 - x^{2} - x + 12 = 0 -4 x + 2 =0-4 x= -2<span> x = 0.5</span>
100=25
1=x
x=(25*1)/100
x=1/4
Подробней объяснить не могу
( X^2 + 12X + 36 ) - ( X^2 - 25 ) = 79
X^2 + 12X + 36 - X^2 + 25 = 79
12X + 61 = 79
12X = 79 - 61
12X = 18
X = 18 : 12
X = 1.5
ОТВЕТ: Х = 1.5