2.
2)в)
-p-p-p-3p-p-p=-8p
3.
1)в)
c-(a+b)=c-a-b
2)в)
x-(a-b)+(c-d)=x-a+b+c-d
4.
1)в)
5x+(11-7x)=5x+11-7x=-2x+11
2)в)
(5-3b)+(3b-11)=5-3b+3b-11=-6
3)в)
(1-9y)-(22y-4)-5=1-9y-22y+4-5=-31y
4х⁴ * (-2х²)³ = 4х⁴ * (-8х⁶) = -32х¹⁰
<span><span>(sin^t+2sintcost-cos^2t)^2=(sin2t-cos2t)^2=(sin2t)^2+(cos2t)^2-2sin2tcos2t=1-sin4t
1 - cos альфа + cos 2альфа / sin 2альфа - sin альфа=
=(1-cosa+2cos^2a-1)/(sina(2cosa-1)=cosa(2cosa-1)/sina(2cosa-1)=cosa/sina=ctga
</span>sin 5пи/18 cos пи/9 - sin пи/9 cos 5пи/18 / sin 5пи/12 sin 7пи/12 - cos 5пи/12 cos 7пи/12=
=sin(5pi/18-2pi/18)/-(cos(5pi/12+7pi/12)=sin(pi/6)/-cospi=1/2
</span>
<span>Д=25+40=65 </span>
<span>х1=(5+корень65)/2 </span>
<span>х2=(5-корень65)/2</span>