I'm new to electrical signal, sorry if my question sounds dumb.
Below is a picture from my text book:
It says a sine wave with a phase of 0° starts at time 0 with a zero amplitude. The amplitude is increasing.
I am little bit confused here, shouldn't that be decreasing? If you watch this simulation (choose oscillate) below:
The single point at time 0 is decreasing.
Is my understanding of how waves propagate incorrect or is the textbook wrong?