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OpenStudy (anonymous):
Find the exact value of cos(11pi/8) A. - sqrt(2 + sqrt(2) / 4) B. sqrt(2 - sqrt(2) / 4) C. sqrt(2 + sqrt(2) / 4) D. - sqrt(2 - sqrt (2) / 4)
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OpenStudy (anonymous):
I am thinking it is D.
OpenStudy (anonymous):
Mostly because if I type cos(11pi/8) it gets me the value -0.38268 and D gets me the same answer. So that is my improper assumption. Haha.
OpenStudy (anonymous):
*type it into my calculator
OpenStudy (butterflydreamer):
that's true LOLL D is correct
OpenStudy (anonymous):
Wowww! Hahaha Thank you for confirming.
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OpenStudy (butterflydreamer):
no probleeem LOL but you did it yourself so :) good job!
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