404. That’s an error.
The requested URL /ex-5-6-8-find-dy-dx-x-a-cos-t-log-tan-t-2-ex-5-6.html was not found on this server. That’s all we know.
/ex-5-6-8-find-dy-dx-x-a-cos-t-log-tan-t-2-ex-5-6.html