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Mathematics 59 Online
OpenStudy (anonymous):

Find the missing value to the nearest hundredth. cos ___ = 9/20

OpenStudy (amistre64):

cos(t) = 9/20 t = arccos(9/20)

OpenStudy (anonymous):

I'm sorry I'm really bad at this but what is arccos?

OpenStudy (amistre64):

its the inverse function to cosine

OpenStudy (amistre64):

it undoes a cosine

OpenStudy (amistre64):

\[t= cos^{-1}(9/20)\] might be a more familiar notation for you

OpenStudy (anonymous):

Yes it is thank you

OpenStudy (amistre64):

yw

OpenStudy (amistre64):

i got no idea of the actual value without a calculator tho

OpenStudy (amistre64):

google arccos(9/20) if need be and itll pop out a radian value for you

OpenStudy (anonymous):

So it's 63.26 degrees I think. Thank you so much

OpenStudy (amistre64):

thats sounds about right :)

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