Don't worry about Q1. The author is just using redundant language and trying to make an obvious statement. I agree that the wording is strange, but it is nothing critical, so don't worry about it.Hi
Please have a look on the attachment. You can find my queries there. Please help me with them. I would be very much grateful.
It seems to me that he is not guessing at the values of those constants, but is instead doing something very specific. He chooses one constant to be zero in order to remove the known solution and isolate the new solution. Then he chooses the other constant to make the other solution have a scale factor of one in front.... You can see another example where the author simply make a guess at the values for c1 and c2. I don't understand his criterion for choosing these specific values. But see if you can make some sense out of his method.
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by Robert Keim
by Luke James