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2015-02-16T14:29:35+08:00

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1.Cos A=11.7431
inverse the function
A=Cos^-1 (11.7431)
A=undefined

2.Cos W=0.6157
inverse the function
W=Cos^-1 (0.6157)
W=52 degrees

3.Cos A=0.5878
inverse the function
A=Cos^-1 (0.5878)
A=54 degrees

Hope this helps =)
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