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Mathematics 16 Online
OpenStudy (anonymous):

find the exact value of cot(arctan(7/24)) I WILL MEDAL AND FAN

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.

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 :-)

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|

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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