Yes ! Thanks !
I can easily output the revert of yellow (or green !

) of n°3 & n°4 : there averrage is = 0. The big problem appears with the 2 first : there average is positive flat (cc componant) signal in first and negative flat signal is 2°.
It's easy to obtain this with a sync inverter :

- opposition phase6.png (9.6 KiB) Viewed 16224 times
But as you see, as the yellow cc componant was negative, the green cc componant has been reverted --> positive. And I'm trying to obtain like in the 2 first images in the precedent post. Not wwhat you see here ! The cc componant of the input should fist known and kept, apply 180°rotation and keep the cc componant at the output to obtain the 2 first curves. And I don't know how to do with my modular arsenal, for the moment.
"Opposit polarity", I can read on the W_ellis link...

This must be the right words in english.
The button 'invert phase' on a mixer is (I believe !) doing exactly what I'm looking for and it can do it with any signal : audio signal instead of perfect sinusoid.
Gonna have some try this after noon with math modules.....