y = -3 cos 2x (find amplitude and period)

[Guest]

Find the amplitude and the period if x belongs to the interval [-2pi, 2pi]

My answer is:

amplitude = 3
period = 1

Now can someone suggest to me where I could find an applet that draws this function freely.

thanks

 

[Mrspi]

Re: y = -3 cos 2x

Find the amplitude and the period

if x belongs to the interval [-2pi, 2pi]


My answer is:

amplitude = 3
period = 1

Now can someone suggest to me where I could find an applet that draws this function freely.

thanks

You are correct on the amplitude, but no the period.

What is the period of the function y = cos x?
If you use "2x" in place of "x",
y = cos 2x
Wouldn't things happen twice as fast, so that one cycle of the cosine function would take place in half the usual interval? Perhaps that will help you determine the period of your function.

Any graphing calculator will graph this function for you. If you plan to continue in math, you'll surely need a graphing calculator sooner or later!

Or, you could do a Google search for "free online graphing application"........

I hope this helps you.