Pre-calculus help? Please and thank you?

Just a Girl

New member
I have three questions I don't quite understand

1.) What is the period of the function y=-5cos2x (I got 2pi)
2.) How are the graphs of the functions below different?
f(x) = sin x
g(x)= sin(x - pi/2)
(I got The graph of g(x) is a horizontal phase shift to the left pi/2 units of the graph of f(x).)

3.) What is the phase shift of the function y =3cos(2x+1)? (I got 3 but when I looked at it again 1/3 is what I got)
 
Back
Top