anonymous
  • anonymous
Which function's graph is shown below? A. y = -sin x B. y = cos x C. y = sin x D. y = -cos x
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
1 Attachment
UnkleRhaukus
  • UnkleRhaukus
which do you think? @SantanaG?
anonymous
  • anonymous
I have no idea :(

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baldymcgee6
  • baldymcgee6
Try using some numbers, it might help.
anonymous
  • anonymous
like what #s though?
UnkleRhaukus
  • UnkleRhaukus
can you find the sine of 0 ?
baldymcgee6
  • baldymcgee6
Like that :)
anonymous
  • anonymous
is sine of 0, 0?
UnkleRhaukus
  • UnkleRhaukus
yes
UnkleRhaukus
  • UnkleRhaukus
what about the cosine of zero ?
anonymous
  • anonymous
1?
UnkleRhaukus
  • UnkleRhaukus
goood, looking at the graph , we see the line passes through the origin , which two options does this eliminate?
anonymous
  • anonymous
the cosine ones b/c it equals 1
UnkleRhaukus
  • UnkleRhaukus
ok good, so we have to choose between y= sin x, y= -sin x
anonymous
  • anonymous
yepp :)
Luigi0210
  • Luigi0210
-sinx
UnkleRhaukus
  • UnkleRhaukus
can you find the sine of π/2
anonymous
  • anonymous
yeah hold on plz
anonymous
  • anonymous
sine of pi/2=0
UnkleRhaukus
  • UnkleRhaukus
nope,
UnkleRhaukus
  • UnkleRhaukus
\[\sin(π/2)=\]
anonymous
  • anonymous
1
anonymous
  • anonymous
sorry
UnkleRhaukus
  • UnkleRhaukus
thats better
UnkleRhaukus
  • UnkleRhaukus
so we have these points |dw:1359689543363:dw|
UnkleRhaukus
  • UnkleRhaukus
|dw:1359689628038:dw|
anonymous
  • anonymous
so it is y=sin(x)
UnkleRhaukus
  • UnkleRhaukus
|dw:1359689692221:dw|
UnkleRhaukus
  • UnkleRhaukus
correct
anonymous
  • anonymous
Sweet! thanks! :)

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