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Mathematics 11 Online
OpenStudy (anonymous):

evaluate cos345 leaving your answer in surd form

OpenStudy (chaise):

cos345=cos15 cos 15 = (1+sqrt(3))/(2sqrt(2))

OpenStudy (anonymous):

the anwer does not tally with option here

OpenStudy (chaise):

http://www.wolframalpha.com/input/?i=cos15

OpenStudy (anonymous):

ok

OpenStudy (anonymous):

got it

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