Posted by Tabby on .
4. Write the equation of the cosine function with an amplitude of 1/3, a period of 2pi, and a phase shift of 3pi/2.
5. Write the equation of the sine function with an amplitude of 4, a period of pi/2, and a phase shift of pi/4.

Trig 
drwls,
4. Y = (1/3) cos (x  3pi/2)
5. Y = 4 sin (4x + pi/4)
The general form is
Y = (amplitude)*(sin or cos)(2 pi x/P  phase shift)
where P is the period.