Babynini
  • Babynini
Find the exact value of cos(arctan (9/40)) how do I do this? :)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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Babynini
  • Babynini
@jim_thompson5910 :) are you free?
jim_thompson5910
  • jim_thompson5910
|dw:1434499638411:dw|
jim_thompson5910
  • jim_thompson5910
let theta = arctan(9/40), so tan(theta) = 9/40 because tan = opp/adj, we can apply these labels |dw:1434499685266:dw|

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jim_thompson5910
  • jim_thompson5910
what is the hypotenuse?
Babynini
  • Babynini
41
Babynini
  • Babynini
is the reason that the opposite is 40 instead of 9 (since tan = opposite/adj) because it's inverse?
Babynini
  • Babynini
hrrm I think you got that backwards actually..
jim_thompson5910
  • jim_thompson5910
oh right, I did lol
jim_thompson5910
  • jim_thompson5910
|dw:1434499832931:dw|
Babynini
  • Babynini
haha k :)
jim_thompson5910
  • jim_thompson5910
|dw:1434499865018:dw|
Babynini
  • Babynini
cos = 40/41
jim_thompson5910
  • jim_thompson5910
cos(arctan (9/40)) = cos(theta) since theta = arctan(9/40)
jim_thompson5910
  • jim_thompson5910
yep 40/41
Babynini
  • Babynini
Fantastic, thanks!
jim_thompson5910
  • jim_thompson5910
np

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