Hi, I need to determine the value of cot(x) at pi/2... but cot(x) is equal to 1/tan(x) and at tan(pi/2) the function is undefined? I'm confused, can anyone explain how determine the value of cot(pi/2)... Thanks

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Originally Posted by sjmiller Hi, I need to determine the value of cot(x) at pi/2... but cot(x) is equal to 1/tan(x) and at tan(pi/2) the function is undefined? I'm confused, can anyone explain how determine the value of cot(pi/2)... Thanks $\displaystyle \cot\left(\frac{\pi}{2}\right) = \frac{\cos\left(\frac{\pi}{2}\right)}{\sin \left(\frac{\pi}{2}\right)} = \frac{0}{1} = 0$

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