Question

Which of the following are equivalent to the function y=3cos x + 2? Check all that apply. (attached below)

Please explain. Thank you!

Answer 1

did you learn symmetries of the unit circle

Answer 2

For example, The cosine function is the X value of a point on the unit circle

If you put in the angle Theta, and the angle -theta, you get the same cosine

Answer 3

That would make it B. and C. then?

Answer 4

Yes, Answer B is seen above, andlooking a little closer answer C is also in the diagram

Sin(theta) = sin(theta +90) pr sin(theta + pi/2)