Solved 18. ( 6 marks) Prove the identity. | Chegg.com
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
csc x= -√2 for π≤x≤3π/2 - Brainly.com
Determine the period and phase shift of f(x) = 2 csc(x - pi/4). Then graph the function. | Homework.Study.com