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2 cot(x) + 1 = -1

2 cot(x) = -2

cot(x) = -1

cos(x)/sin(x) = -1

cos(x) = - sin(x)

x = 135°, 315°, 495°, ... another one every 180 degrees

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Q: 2 cot x plus 1 equals -1?
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