- anonymous

Am I typing this into my calculator correctly?

- jamiebookeater

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- anonymous

I have this problem,
|dw:1360532525098:dw|

- anonymous

And I type it in my calculator like this,

- anonymous

-(3/4)sin(x-(pi/4))
But when I graph it, its on none of my answer choices

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## More answers

- anonymous

Are you in radian mode?

- anonymous

Anyhow, try this graph: http://www.wolframalpha.com/input/?i=y%3D-%283%2F4%29sin%28x-%28pi%2F4%29%29

- anonymous

Yes

- jim_thompson5910

also make sure you have the right window to see things
so use zoom trig to get a better look (that usually works)

- anonymous

I zoomed in but it shows that the curve cuts through the center, which isnt on any of my choices

- jim_thompson5910

it's not supposed to cut through the center because of the phase shift that moves it to the right a bit
normally sine graphs go through the origin, but not this one

- anonymous

|dw:1360532870601:dw|
This is what I get when I zoom in,

- jim_thompson5910

you should have something like this
|dw:1360533064327:dw|

- jim_thompson5910

here's a better look at the actual graph (see attached image)

##### 1 Attachment

- anonymous

I no where near got that, did you type the same exact thing I typed in?

- jim_thompson5910

yes I typed in
(-3/4) sin(x - pi/ 4)

- jim_thompson5910

try using 3.14 in place of pi and see if that changes anything

- anonymous

When I typed in exactly what you just wrote it worked, maybe it was my choice of placing the parenthesis?

- jim_thompson5910

maybe, hmm wish i could see your calculator before and after, but oh well

- jim_thompson5910

glad you got it working though

- anonymous

I can re type what I wrote in & take a picture if you would like?

- jim_thompson5910

sure that would be great, thanks

- anonymous

Ah, my apologies,
I typed in mine ( -(3/4)sin(x-(pi/4)) )
& I used the negative sign instead of the subtraction sign between the x & pi

- jim_thompson5910

oh so that would have made x-pi/4 to be -pi/4*x
i see now

- anonymous

Yes, if you typed in what I had & instead of using the subtraction symbol & the negative one instead you would of got what I got

- jim_thompson5910

yeah I'm getting what you got now, such a small error that I wouldn't have even thought about it lol

- anonymous

Yeah, one small error completely changes the whole graph haha.
I noticed it when I was re-typing my problem in & it came out right.
Had me confused.
Anywho, thank you for help.!

- jim_thompson5910

you're welcome

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