Ответ:
Объяснение:
-8√5=-√8²×5=-√64×5=-√320
4x+3y x= -3/4; y= -1/6
4*(-3/4)+3*(-1/6)=-3-1/2=-7/2
-x-2+3(x-3)=3(4-x) -3;
-х-2+3х-9=12-3х-3;
2х+3х=9+11;
Х=20:5;
Х=4
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Сos²2x + Cos6x - Sin²2x = 0
Cos4x + Cos6x = 0
2Cos5xCosx = 0
Cos5x = 0 или Cosx = 0
5x = π/2 + πk, k ∈Z x = π/2 + πn , n ∈Z
x = π/10 + πk/5, k ∈Z