Question

Please help !
verify the identity cot(0-pi/2)= -tan 0

Answer 1

\(cot(0- \frac{\pi}{2}) \) is same as : \(cot(-\frac{\pi}{2})\)

Answer 2

Now using :

\[\cot(-x) = -\cot(x)\]

\[\cot(\frac{-\pi}{2}) \implies -\cot(\frac{\pi}{2})\]