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if cos Q=5/9, find 5/9

5/9

arccos 5/9 is quite another thing, it is equal to 56.25 deg

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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