<span>Sin5x+Sin3x-Sin4x=0
2Sin4xCosx - Sin4x = 0 (*)
Sin4x(2Cosx -1) = 0
Sin4x = 0 или 2Cosx -1 = 0
4x = </span>πk, k ∈ Z Cosx = 1/2
<span>x = </span>πk/4, k ∈ Z x = +-arcCos1/2 + 2πn , n ∈Z
<span> x = +-</span>π/3 + 2πn , n∈Z<span>
2Sin4x*Cosx-Sin4x=0 (смотри *)</span>
Ответ этого примера:15,88
Вместе они пройдут 50+40 = 90 км, расстояние между ними будет 130-90 = 40 км.
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