Малыш 5sinx+4sin(π/2+x)=4 5(1-cosx)+4cos(x) = 4 5 - 5cosx + 4cos(x) = 4 5cosx - 4cos(x) - 1 = 0 cos(x) = 1 и cos(x) = -1/5 --> x = 2πk и x = ±arccos(1/5)+2πk