## gjhfdfg 2 years ago Am I typing this into my calculator correctly?

1. gjhfdfg

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

2. gjhfdfg

And I type it in my calculator like this,

3. gjhfdfg

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

4. Zelda

5. Zelda

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

6. gjhfdfg

Yes

7. 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)

8. gjhfdfg

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

9. 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

10. gjhfdfg

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

11. jim_thompson5910

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

12. jim_thompson5910

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

13. gjhfdfg

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

14. jim_thompson5910

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

15. jim_thompson5910

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

16. gjhfdfg

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

17. jim_thompson5910

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

18. jim_thompson5910

glad you got it working though

19. gjhfdfg

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

20. jim_thompson5910

sure that would be great, thanks

21. gjhfdfg

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

22. jim_thompson5910

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

23. gjhfdfg

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

24. jim_thompson5910

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

25. gjhfdfg

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.!

26. jim_thompson5910

you're welcome