X^2-2x+5x-2-25+20x-4x^2=-3x^2+23x-27
<span>sin(π/2+2x)ctg3x+sin(π+2x)-√2cos5x=0
cos2x *cos3x/sin3x -sin2x-√2cos5x=0
(cos2xcos3x-sin2xsin3x-√2cos5xsin3x)/sin3x=0
</span><span>cos2xcos3x-sin2xsin3x-√2cos5xsin3x=0 U sin3x≠0
cos(3x+2x)-</span>√2cos5xsin3x=0
cos5x-<span>√2cos5xsin3x=0
cos5x(1-√2sin3x)=0
cos5x=0⇒5x=π/2+πn⇒x=π/10+πn/5
sin3x=1/√2⇒3x=(-1)^n *π/4+πn⇒x=</span><span>(-1)^n *π/12+πn</span>/3
4/25-0,06=0,16-0,06=0,1;
2/5:0,14=0,4:0,14=40:14=2,86.