# Math Help - graphing

1. ## graphing

I'm trying to graph:

3cos[(pi/2x)+(6pi/5)] within the interval [8,-8],

but I'm not getting the right answer when I plot the points. I have one of the points at (-2.4,3) and the rest of the graph should follow given I can only move one point on the graph and the rest of the graph will follow in accordingly

2. ## Re: graphing

Originally Posted by jonathanraxa
I'm trying to graph:

3cos[(pi/2x)+(6pi/5)] within the interval [8,-8],

but I'm not getting the right answer when I plot the points. I have one of the points at (-2.4,3) and the rest of the graph should follow given I can only move one point on the graph and the rest of the graph will follow in accordingly
Is your function \displaystyle \begin{align*} 2\cos{\left(\frac{\pi}{2}x + \frac{6\pi}{5}\right)} \end{align*} or \displaystyle \begin{align*} 2\cos{\left(\frac{\pi}{2x} + \frac{6\pi}{5}\right)} \end{align*}?

3. ## Re: graphing

My function is the first one function you put down. Sorry.