Simulink - averaging waves

Hello everyone,

I'm trying to create a model on Simulink that first takes an input of a Sine wave and displays it.Following that, I will activate a manual switch and it will take another input(either a wave or constant)

What I hope to achieve is for this second input to be averaged out with the first input (for example if the first input is a sine wave and the second input is a cosine wave, it'll average out and show a 0 in the display). Following this, if I were to have more input, they will continue to average out with all the previous inputs.

Anyone has any advice for this?

Thanks in advance!

Ronald