<span>x+2<5x-2(x-3)
</span>х+2<5x-2х+6
х-5х+2х<6-2
-2х<6
х больше -2
25-12х+x^2-25-25+10x-x^2= -2х - 25
180 - 2*70 = 180 - 140 = 40
40
1) sin(pi/3 + a) = sin(pi/3)*cos a + cos(pi/3)*sin a2) sin(pi/3 - a) = sin(pi/3)*cos a - cos(pi/3)*sin a<span>3) sin... + sin... = 2*sin(pi/3)*cos a = sqrt(3)*cos a</span>