ti-84 question

Elin

Yes, I am impaired in some fashion. I can't find the book to this thing and I have NO clue how to use it. I'm taking Trig this semester and we're graphing things. I'd like to use this calculator to check my work. I can figure out sin, cos, and tan. I can't figure out how to graph for csc, sec, or cot. I bought this thing for stats and that's pretty much all I've used it for, please teach me.

ex. y=sec πx-1

I'm pretty sure I've done it correctly by hand, but learning how to use my calculator to check it would be cool, too.

proXimity

What exactly is your problem? Are you unable to enter the equation into the equation editor (y= ect) window, or are you doing that and it's not showing up?

Elin

I enter it in using that cos-1 button ( I think that's the right one to use) and it gives me a vertical line. I can enter in the equation using cos and it gives me the cos graph just fine.

matt has a problem

Here's your manual - http://education.ti.com/downloads/guidebooks/graphing/84p/TI84PlusGuidebook_EN.pdf

Caution: It's almost 500 pages long.

musanman

are you in radians or degrees, go to mode

Photosynthesis

cos^-1 is the inverse of cosine, not secant. For secant you need 1/cos(x)

L Ron Howard

IIRC, they don't directly support sec, csc or cot. You have to manually enter the formulas, like cos^-1 etc.

Elin

Photosynthesis wrote: »

cos^-1 is the inverse of cosine, not secant. For secant you need 1/cos(x)

Ok, got this now.

New issue.
My mode is in radians. I have y=sin(2x-π). Now, the -π part should shift my graph to the right by π, but it doesn't. It just gives me the graph for sin(2x). If I change it to y=sin(2x-1) it shifts it to the right ... why won't it do it as it's written with π?

musanman

Elin wrote: »

Photosynthesis wrote: »

cos^-1 is the inverse of cosine, not secant. For secant you need 1/cos(x)

Ok, got this now.

New issue.
My mode is in radians. I have y=sin(2x-π). Now, the -π part should shift my graph to the right by π, but it doesn't. It just gives me the graph for sin(2x). If I change it to y=sin(2x-1) it shifts it to the right ... why won't it do it as it's written with π?

if you're actually typing in "n" I'm not sure what you think it will do. Your calculator will only graph x values, any other letter you plug in will be treated as the number that is stored as that variable. If you type "n" in the main window it will show you what is stored as n (or maybe just do a simple operation I'm not sure).

ilmmad

I think that's pi, not n.

If he had used n, it would have a number stored in it. It would work in the equation.

As for your problem, OP, are you sure you aren't confusing the waves for sine and cosine? Sine shifted right by pi is cosine. There isn't any reason I can think of why the pi wouldn't work.