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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