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OpenStudy (anonymous):
find the exact value of cot(arctan(7/24))
I WILL MEDAL AND FAN
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OpenStudy (anonymous):
24/7
OpenStudy (anonymous):
how did u get that?
OpenStudy (anonymous):
I just plugged in to the calculator
OpenStudy (anonymous):
Use the graphing calculator
OpenStudy (anonymous):
lol u think u can help me out by not using a calculator.
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OpenStudy (anonymous):
nope
OpenStudy (alekos):
I might be able to do that
OpenStudy (alekos):
cot(arctan(7/24)) = 1/(tan(arctan(7/24))) = 1/(7/24) = 24/7
OpenStudy (michele_laino):
by definition, if:
\[\Large \theta = \arctan \left( {\frac{7}{{24}}} \right)\]
then:
\[\Large \tan \theta = \frac{7}{{24}}\]
OpenStudy (anonymous):
that is what I did lol :-)
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OpenStudy (anonymous):
hmm
OpenStudy (anonymous):
oh ok i get it now. lol i was just making it too complicated
OpenStudy (michele_laino):
ok! :)
OpenStudy (anonymous):
Can you help me determine the algebraic expression for tan(arccos(x))?
OpenStudy (anonymous):
|dw:1446400263218:dw|
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OpenStudy (anonymous):
|dw:1446399998540:dw|
OpenStudy (michele_laino):
we can make this reasoning:
if we have:
\[\Large \theta = \arccos x\]
then:
\[\Large \cos \theta = x\]
OpenStudy (anonymous):
|dw:1446400300665:dw|
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