Homework Help: Two cos/sin wave graphing question

1. Apr 12, 2009

rought

1. The problem statement, all variables and given/known data

3. The attempt at a solution

For #3 I need to finde the cos graph equation here's what I got: shift to the right 2, Amplitude = 3, b = π/2

equation: y=3cosπ/2(x-2)

I'm just not sure if i have it in the right format or if I'm even right

Attempt for #4 Amplitude=2 Shift left = 1 Shift up= 3

n data[/b]

I'm just not sure if I am doing it right for both of them

2. Apr 12, 2009

qntty

You're solutions appear to be right, but I'm not sure what you mean by the right format.

3. Apr 13, 2009

meiso

For your first solution, you are correct, but if when you say "format" you are referring to a simpler form, you may wish to use the identity $$cos(x - \pi) = -cos(x)$$ to simplify the equation.