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= - 1/2 + 1/2 + (-1/2√2)
= -1/2√2 ≈ - 0.707106781187
= [cos(120) + sin(-210) + sin(315)] / cotan(45)
= [(-1/2) * 1/2 * (-1/2 √2)] / 1
= (-1/2) * 1/2 * (-1/2 √2)
= -1/4 * (-1/2 √2)
= 1/8 √2