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Cot graph

Why does the cot graph cross at (pi/2,0) if tan(pi/2)=0? Isn't it undefined?
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Original post by abz456
Why does the cot graph cross at (pi/2,0) if tan(pi/2)=0? Isn't it undefined?


Post in the maths forum, otherwise you're gonna get delays on your questions like this.

It's easier to just think of cot⁡x≡cos⁡xsin⁡x\cot x \equiv \dfrac{\cos x}{\sin x} as your standard identity.

Clearly sin⁡x≠0\sin x \neq 0 and cos⁡x\cos x are defined at x=π2x=\dfrac{\pi}{2} and hence cot⁡x\cot x is.

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