100 * (8+7) = 100 * 56 = 5600
8Sin²(π/8 -2x) - Cos²(π/8 -2x) = 1/2Sin(4x -π/4)
8Sin²(π/8 -2x) - (1 - Sin²(π/8 -2x)) = 1/2Sin(4x -π/4)
Sin²(π/8 -2x) +7Sin²(π/8 -2x) - (1 - Sin²(π/8 -2x)) = 1/2Sin(4x -π/4)
Sin²(π/8 -2x) +7Sin²(π/8 -2x) - 1 + Sin²(π/8 -2x) = 1/2Sin(4x -π/4)
7Sin²(π/8 -2x) = 1/2*2Sin(2x -π/8)Cos(2x -π/8)
7Sin²(π/8 -2x) = Sin(2x -π/8)Cos(2x -π/8)
7Sin²(π/8 -2x) - Sin(2x -π/8)Cos(2x -π/8) = 0
7Sin²(π/8 -2x) + Sin(π/8 -2x)Cos(2x -π/8) =0
Sin(π/8 -2x)(7Sin(π/8 -2x + Cos(π/8 -2x)) = 0
Sin(π/8 -2x) = 0 или 7Sin(π/8 -2x + Cos(π/8 -2x)= 0 | : Cos(π/8 -2x)≠0
π/8 -2x = πn, n∈Z 7tg(π/8 -2x) +1 = 0
2x = π/8 - πn , n∈Z tg(π/8 -2x) = -1/7
x = π/16 -πn/2, n ∈Z π/8 -2x = arctg(-1/7) + πk , k ∈ Z
x = π/16 +2arctg(1/7) -2πk , k ∈Z
<span>4log3(9корень3)+5^log5(11) = 4 log3 3^2*3^(1/2) + 11= 4 * 2.5 + 11 = 10+11=21</span>
4х-32=-5
4х=32-5
4х=27
х=27:4
х=6.75
по моему так
<span>0,4(3x+1)=5,6-3(2-0,4x)
1.2x+0.4=5.6-6+1.2x (1.2x взаимно уничтожаются)
0.4</span>≠ -0.4<span>
</span>