Posted by chris on Monday, November 8, 2010 at 4:29pm.
if cos Q=5/9, find 5/9

12th grade  bobpursley, Monday, November 8, 2010 at 4:39pm
5/9
arccos 5/9 is quite another thing, it is equal to 56.25 deg

12th grade  dunno, Monday, September 12, 2016 at 11:31pm
cos(Q)=5/9
cos inverse both sides
cos^1(cos(Q))=cos^1(5/9)
cos^1(cos(Q))=Q, based on inverse properity
Q=cos^1(5/9)
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