Your post is a single line, without punctuation, containing multiple pieces that make the problem completely unreadable....
use the standard "i" instead of "j" for the square root of -1
what does the "_" symbol mean? is it supposed to be "-"?
"Z" is not the same as "z"; you haven't defined "Z"
assuming "Z" is supposed to be the same as "z", is the expression you are supposed to determine really "z1z2-z3/z3" = ? Or are you missing some parentheses there?
You are wasting your time and ours if you don't take the time to post your questions clearly....
