-2x+2=4-2х=2
х=-1
как-то так
Cos(x/2 + П/4) =–1
Х/2+ П/4= ± П + 2Пн
Х/2= ± П– П/4 + 2Пн
Х/2= ± 3П/4 + 2Пн
Х= ± 6П/4 + 4Пн
2cos x*sin x - sin^2 x - 2sin x - 2cos x + sin x + 2 = cos^2 x
2cos x*sin x - sin x - 2cos x + 2 = cos^2 x + sin^2 x = 1
2cos x*sin x - 2cos x - sin x + 1 = 0
2cos x*(sin x - 1) - (sin x - 1) = 0
(2cos x - 1)(sin x - 1) = 0
1) cos x = 1/2; x1 = +- pi/3 + 2pi*k
2) sin x = 1; x2 = pi/2 + 2pi*k
-10^5-10^3+10^2=10^2(-10^3-10^1+1)=10^2(-1000-10+1)=100*(-1009)=-100900.
А) 7a(a-b)-b(b-7a)=7а²-7ab-b²+7ab=7a²-b²
б) 3x(x-2a)-6a(a-x)=3х²-6ах-6а²+6ах=3х²-6а²=3(х²-2а²)
в) <span>(y</span>²<span>\z</span>⁸<span>)</span>⁵<span>=у</span>¹⁰/z⁴⁰