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?

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- Jul 26th 2009, 01:12 PMazurephantomCotangent 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? - Jul 26th 2009, 01:16 PMred_dog
$\displaystyle \cot\frac{\pi}{2}=\frac{\cos\frac{\pi}{2}}{\sin\fr ac{\pi}{2}}=\frac{0}{1}=0$

- Jul 26th 2009, 01:21 PMazurephantom
Oh I see how it works.