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22 March, 16:35

find exact value using reference angles

cot - 53pi/6

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  1. 22 March, 16:38
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    It's the same as cot (-150 or - 5pi/6) and that's a reference angle of 30 so cot 30 or pi/6 is sqrt (3) and since it's in the 3rd quadrant, it's positive.
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