Please look at picture.

My textbook only gives the answer with -pi as a phase constant. But, since we are at "a switching point" on the unit circle, the sign doesn’t really matter. The graphs give the same result whether a positive or negative sign is used. Am I right? Does it conceptually change anything?

My textbook only gives the answer with -pi as a phase constant. But, since we are at "a switching point" on the unit circle, the sign doesn’t really matter. The graphs give the same result whether a positive or negative sign is used. Am I right? Does it conceptually change anything?

http://ift.tt/1irW9Tr