Find the exact value of cos(arctan (9/40)) how do I do this? :)

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Find the exact value of cos(arctan (9/40)) how do I do this? :)

Mathematics
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@jim_thompson5910 :) are you free?
|dw:1434499638411:dw|
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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Other answers:

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

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