Provide an Appropriate Response $$\text { Find d } \mathrm { d } ^ { 998 } / \mathrm { dx } ^ { 998 } ( \cos \mathrm { x } )$$

Provide an appropriate response.
- $$\text { Find d } \mathrm { d } ^ { 998 } / \mathrm { dx } ^ { 998 } ( \cos \mathrm { x } )$$