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sin x + sin y = sinx × cosy + cosx × siny
sinx(1 - cosy) + sin(1 - cosx) = 0
4×sinx / 2×cosx / 2×sin²y / 2 + 4×siny / 2×cosy / 2×sin²x / 2 = 0 /4
sinx / 2×siny / 2[sin(x / 2 + y / 2)] = 0
sinx / 2 = 0 ∨ siny / 2 = 0 ∨ sin(x / 2 + y / 2) = 0
x = 0 ∨ y = 0 ∨ y = -x