I have a tiny problem with understanding a thing here.
for the 1st the phase shift is 0 degrees, so on its modulated wave we put 180-degree phase shift.
for the 2nd 0, the oscillator puts a 90-degree phase shift in the carrier signal and as it's a 0-degree we have to put 180-degree shift.
When we sum up the two 0's in the final wave, how are we getting the -135 degree???
I'm unable to understand the summing. https://prnt.sc/gP0OypJ3n_jB