(6а-2)^2=36а^2-24а+4
(5b+6)^2=25b^2+60b+36
(4+2a)^3=64+96a+32a^2+8a^3
(2a-1)^3=8a^3-12a^2+6a-1
<span>2;0;-2;-4;-6;-8;-10. А S=7*(2+(-10))/2=-28</span>
(b+c)²-b(b-2c)=b²+2bc+c²-b²+2bc=4bc+c²
<span> 1+2cosx=sin2x+2sinx x€[-7/2</span>π<span>;-2</span>π<span>]
1 + 2Cosx - Sin2x - 2Sinx = 0
(1 - Sin2x) + ( 2Cosx -2Sinx) = 0
(Sin</span>² x + Cos²x - 2SinxCosx) + 2(Cosx -Sinx) = 0
(Cosx -Sinx)² + 2(Cosx -Sinx) = 0
(Cosx - Sinx)(Cosx -Sinx +2) = 0
Cosx - Sinx = 0 |:Cosx или Cosx -Sinx +2 = 0
1 - tgx = 0 Cosx -Sinx = -2
tgx = 1 ∅
x = π/4 + πk , k ∈ Z