Hello everyone. So I have a test coming up and I am struggling with the concept of figure out what the initial phase or angle of a transfer function is. For instance, consider the following transfer function: L(s) = 4/s(.4s+1)(s+2) So the initial angle for L(s) is -90 degrees. Is there a simple trick for figuring that out given any transfer function? I have heard that if there is a negative in the numerator then you add 180 degrees of phase or depending on the degree of the denominator you would subtract phase. Can someone help me sort this out?