Adding sine waves of different phase, sin(π/2) + sin(3π/2)? Adding sine waves of different phase, what is $\sin(\pi/2) + \sin(3\pi/2)$?
Please could someone explain this.
Thanks.

Heres the plot for $\sin(L)$ where $L$ goes from $(0, \pi/2)$

Heres the plot for $\sin(L) + \sin(3L)$ where $L$ goes from $(0, \pi/2)$

I hope this distinction is useful to you.
This was done in Mathematica.
