<u><em>во вложении</em></u>
<u><em>,,,,,,,,,,,,,,,,,,</em></u>
4xy+8x-6-3y= 4x(y+2)-3(2+y)= (y+2)*(4x-3)
б)<span> ℓog2x+3(5x2+11x+3)=2</span>
<span>5x²+11x+3=(2x+3)²</span>
<span>5x²+11x+3=4x²+12x+9</span>
<span>5x²+11x+3-4x²-12x-9=0</span>
<span>x²-x-6=0</span>
<span>D = 1²-4*1*(-6)=1+24=25</span>
<span>x1=(1+5)/2=3</span>
<span>x2=(1-5)/2=-2</span>
Cos^3 + cos^41 * cos^3 + cos^3 * cos^3 * cos^13 = 4cos^3 + cos^41 + cos^13