Describe the derivations on K [ X , Y , Z ] / ( Z 2 − X 2 − Y 2 ) {\displaystyle {}K[X,Y,Z]/(Z^{2}-X^{2}-Y^{2})} and show that there are no unitary derivations on it.
![{\displaystyle {}K[X,Y,Z]/(Z^{2}-X^{2}-Y^{2})}](https://wikimedia.org/api/rest_v1/media/math/render/svg/3bd91abcb939570e3785c41cf0b44f2a928e7d1e)