anonymous
  • anonymous
Trig help pls
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
If cosine of x equals 1 over 2, what is sin(x) and tan(x)
welshfella
  • welshfella
|dw:1438375749215:dw|
welshfella
  • welshfella
is you find what the value of y is using the pythagoras theorem then yo'll have your answers

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welshfella
  • welshfella
as you see cos x = adj / hyp = 1/2
anonymous
  • anonymous
I think I can get it from here, I will do it and then I want you to check my work
welshfella
  • welshfella
yea ok
anonymous
  • anonymous
can the y be negative?
welshfella
  • welshfella
oh no y^2 = 2^2 - 1^2
anonymous
  • anonymous
right, silly me
anonymous
  • anonymous
y = sqrt(5) im here so far, now i use SohCahToa
welshfella
  • welshfella
no y^2 = 2^2 - 1^2 = 4 - 1 = 3
anonymous
  • anonymous
oh god, where's my head......i lost it xD
welshfella
  • welshfella
applying pythagoras 2^2 = 1^1 + y^2 y^2 = 2^2 - 1^1
welshfella
  • welshfella
lol so now you only have to apply SOHCAHTOA to get the sine and tangent
welshfella
  • welshfella
|dw:1438376420375:dw|
anonymous
  • anonymous
sin = sqrt(3)/2 tan = sqrt(3)/1
welshfella
  • welshfella
right that triangle is worth remembering as it comes in useful for a lot of trig questions in fact there are 2 worth knowing
welshfella
  • welshfella
|dw:1438376617866:dw|
welshfella
  • welshfella
|dw:1438376648938:dw|
anonymous
  • anonymous
thank you
welshfella
  • welshfella
yw

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