Really good explanation, this was super helpful especially since you wrote the equations after, and showed how they related to the definitions of even and odd.
Greetings can you help me with this.Supposed (5/13,-12/13) is the terminal point on the unit circle, determined by t. Find the terminal point determined by -t +pi/2
I guess I'm missing something. If I plug in cos(-135) into my calculator, I get negative 0.707 so I don't understand how it's an even function. I can see how cosine is an even function in quadrants 1 and 4, but not in quadrants 2 and 3. Can you please explain?
Being an even function means cos(x) = cos(-x) for every value of x. If you put cos(135) in your calculator you should get the same value as cos(-135). Notice also that 135 degrees is in Q2 and -135 degrees is in Q3.
@@TheInfiniteLooper Thanks for the quick reply. I get it now. It was just a misunderstanding on my part. I watched the video again and it's there. I just had a brain fart...lol. Thanks again!
