Cotangent pi/2

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July 26th 2009, 01:12 PM
azurephantom

Cotangent pi/2

I know that

Tan(0) = 0
Tan(pi/4) = 1
tan(pi/2) = undefined

Cot(0) = 1/0 = undefined
Cot(pi/4) = 1/1 = 1

Cot(pi/2) = This is the one I am stuck at.
Since it equals 1/undefined. What happens?
July 26th 2009, 01:16 PM
red_dog

$\cot\frac{\pi}{2}=\frac{\cos\frac{\pi}{2}}{\sin\fr ac{\pi}{2}}=\frac{0}{1}=0$
July 26th 2009, 01:21 PM
azurephantom

Oh I see how it works.

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