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Cotangent (cot): is the reciprocal of tan, i.e. the ratio of the length of the adjacent side to the length of the opposite side.
Important note:There is a big difference between cot θ and tan^{1}x. The first one means "1/tan θ". The second one involves finding an angle whose tangent is x. So on your calculator, don't use your tan^{1} button to find cot θ. 