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Firstly, with the unit circle (r=1) we need to know that:

at 270 degrees our coordinates are (0, -1)


sine(270 degrees) = -1

cosine(250 degrees) = 0


cotangent = cosine / sine

therefore: cot ( 270 degrees) = 0/-1 = 0


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4y ago

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Q: What is cotangent of 270 degrees?
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