## SantanaG Group Title Which function's graph is shown below? A. y = -sin x B. y = cos x C. y = sin x D. y = -cos x one year ago one year ago

1. SantanaG

2. UnkleRhaukus

which do you think? @SantanaG?

3. SantanaG

I have no idea :(

4. baldymcgee6

Try using some numbers, it might help.

5. SantanaG

like what #s though?

6. UnkleRhaukus

can you find the sine of 0 ?

7. baldymcgee6

Like that :)

8. SantanaG

is sine of 0, 0?

9. UnkleRhaukus

yes

10. UnkleRhaukus

what about the cosine of zero ?

11. SantanaG

1?

12. UnkleRhaukus

goood, looking at the graph , we see the line passes through the origin , which two options does this eliminate?

13. SantanaG

the cosine ones b/c it equals 1

14. UnkleRhaukus

ok good, so we have to choose between y= sin x, y= -sin x

15. SantanaG

yepp :)

16. Luigi0210

-sinx

17. UnkleRhaukus

can you find the sine of π/2

18. SantanaG

yeah hold on plz

19. SantanaG

sine of pi/2=0

20. UnkleRhaukus

nope,

21. UnkleRhaukus

$\sin(π/2)=$

22. SantanaG

1

23. SantanaG

sorry

24. UnkleRhaukus

thats better

25. UnkleRhaukus

so we have these points |dw:1359689543363:dw|

26. UnkleRhaukus

|dw:1359689628038:dw|

27. SantanaG

so it is y=sin(x)

28. UnkleRhaukus

|dw:1359689692221:dw|

29. UnkleRhaukus

correct

30. SantanaG

Sweet! thanks! :)