ОДЗ: х+1>0, 2x+4>0, x+5>0
<span>2+cos2x=2</span><span>sin</span><span>x</span>
-sin^2(x)+cos^2(x)+2=2 sin(x)
cos(2x)-2 sin(x)=-2
(x+6)^2=x^2+12x+36
................
480/4=120 дуб.