2cos^2(x) + sin(2x) - 2 = 0
2cos^2(x) + 2sin(x)cos(x) - 2 = 0
2cos^2(x) + 2sin(x)cos(x) - 2sin^2(x) - 2cos^2(x) = 0
sin(x) * ( 2cos(x) - 2sin(x) ) = 0
1) sin(x) = 0 или 2) 2cos(x) = 2sin(x)
1) x = pi*n;
2) ctg(x) = 1
x = pi/4 + pi*k;
2cos^2(x) + sin(2x) - 2 = 0
2cos^2(x) + 2sin(x)cos(x) - 2 = 0
2cos^2(x) + 2sin(x)cos(x) - 2sin^2(x) - 2cos^2(x) = 0
sin(x) * ( 2cos(x) - 2sin(x) ) = 0
1) sin(x) = 0 или 2) 2cos(x) = 2sin(x)
1) x = pi*n;
2) ctg(x) = 1
x = pi/4 + pi*k;