![trigonometry - Since $\tan(25\pi/2)$ is undefined, and $\cot x = \frac{1}{\tan x}$, then why isn't $\cot(25\pi/2)$ undefined instead of $0$? - Mathematics Stack Exchange trigonometry - Since $\tan(25\pi/2)$ is undefined, and $\cot x = \frac{1}{\tan x}$, then why isn't $\cot(25\pi/2)$ undefined instead of $0$? - Mathematics Stack Exchange](https://i.stack.imgur.com/tFfsY.gif)
trigonometry - Since $\tan(25\pi/2)$ is undefined, and $\cot x = \frac{1}{\tan x}$, then why isn't $\cot(25\pi/2)$ undefined instead of $0$? - Mathematics Stack Exchange
![If tan (picottheta) = cot (pitantheta) , then show that tantheta = 14 [2n + 1±√(4n^2 + 4n - 15) ] , where n>1 or n< - 2 . If tan (picottheta) = cot (pitantheta) , then show that tantheta = 14 [2n + 1±√(4n^2 + 4n - 15) ] , where n>1 or n< - 2 .](https://haygot.s3.amazonaws.com/questions/1593940_1730964_ans_19d044251d674951aa1541164d035616.jpg)
If tan (picottheta) = cot (pitantheta) , then show that tantheta = 14 [2n + 1±√(4n^2 + 4n - 15) ] , where n>1 or n< - 2 .
![trigonometry - Why is $\pi/2$ omitted from the solution of $\cot x = 3 \sin 2x$? - Mathematics Stack Exchange trigonometry - Why is $\pi/2$ omitted from the solution of $\cot x = 3 \sin 2x$? - Mathematics Stack Exchange](https://i.stack.imgur.com/JBdPP.png)
trigonometry - Why is $\pi/2$ omitted from the solution of $\cot x = 3 \sin 2x$? - Mathematics Stack Exchange
![calculus - How can I evaluate $\lim_{n\to\infty}\Big[ \cot(\pi\sqrt{100n^2+n+1}\Big]$ - Mathematics Stack Exchange calculus - How can I evaluate $\lim_{n\to\infty}\Big[ \cot(\pi\sqrt{100n^2+n+1}\Big]$ - Mathematics Stack Exchange](https://i.stack.imgur.com/jX1Av.jpg)