B billcarson New member Joined Jul 12, 2015 Messages 1 Jul 12, 2015 #1 Having trouble understanding the part in the answer circled in red below . How is this derived ? Question: Answer: Attachments question.jpg 31 KB · Views: 4 answer.jpg 138 KB · Views: 5 Last edited by a moderator: Jul 13, 2015
Having trouble understanding the part in the answer circled in red below . How is this derived ? Question: Answer:
