The phase-angle for the term 1/(jw -1) = -1/(1-jw) is given by,
-180 + (phase of 1/(1-jw)) = -180 + (-tan^-1(-w)).
As w -> 0 phase = -180 deg.
for large values of w,: -tan^-1(-w) = 90.Total phase = -180 + 90 = - 90 deg.
for w = 1,-tan^-1(-1) = 45 deg..Total phase = -180 + 45 = -135 deg.